How can I update a var inside a whole kotlin class through a method and then retrieve it updated with another method call

I've written a kotlin class with an overridden fun and a fun to update a var into the class scope (I'm tragically new to Kotlin!)

class mySampleClass: sampleReference(){
    var varToBeUpdated:String = "my string" //var in class scope to be updated

    fun updateMyVar(gotString:String){

        //I tried this, it didn't work
        this.varToBeUpdated = gotString
        // also this didn't work
        varToBeUpdated = gotString

    }

    override fun sample(context: Context, intent: Intent){
        //here i need my varToBeUpdated with new string
        runSomeThing(varToBeUpdated)
        //some work to be done here
    }
}

In the place where I call the methods i do:

myObject.updateMyVar("new string")
myObject.sample()

I wonder how I can update the var i need, since I cannot add new args in the "fun sample", due to the fact it's overriding a class method

Thanks in advance, best regards to everyone :)

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UPDATE: add my actual code, due to the fact that the class it seems unable to keep on the right updated value as i call the overrid method:

Here is my BroadcastReceiver, to check whem download is completed and them perform some action

class DownloadBroadcastManager: BroadcastReceiver() {

    var myClassFilename:String = "default"
    var myClassExtension:String = ".default"

    override fun onReceive(context: Context, intent: Intent) {
        val action = intent.action

        if (DownloadManager.ACTION_DOWNLOAD_COMPLETE == action) {
            //Show a notification
            // here there's a log to check if var are updated
            println("myTag - variables $myClassFilename, $myClassExtension")

            Toast.makeText(context, "Download of $myClassFilename$myClassExtension completed", Toast.LENGTH_LONG).show()
            // richiama azioni come player o display image o altro?

            //player
            var uri = Uri.parse (Environment.getExternalStorageDirectory().getPath() + "/Download/$myClassFilename$myClassExtension") //myClassExtension is ".mp3", dot is included, however it seems class is re-intialized as i call the method
            println("myTag - uri: $uri")
            println("myTag - context: $context")

            var mPlayer = MediaPlayer() // I added this declaration (that's be re-done later) cause I had a problem in making the player running (of course giving it a valid path to a valid file). Now this is "junk code"
            mPlayer.stop()
            mPlayer.reset()
            mPlayer.release()
            mPlayer = MediaPlayer.create(context, uri) // here there's the proper declaration + initialization
            mPlayer.start()

        }
    }
}

Here is the part from my DownloaderClass...

var brReceiver = DownloadBroadcastManager()
    // shows when download is completed
    println("myTag - ${brReceiver.myClassFilename}, ${brReceiver.myClassExtension}: originals") //here shows the default: it's right
    val intent = Intent(context, MainActivity::class.java)
    brReceiver.myClassFilename = myTitle // inject filename
    brReceiver.myClassExtension = ".mp3" // inject file extension
    println("myTag - ${brReceiver.myClassFilename}, ${brReceiver.myClassExtension}: modified") // here it shows my class property as correctly updated

    brReceiver.onReceive(context, intent) // here, as calling the override fun, it get back to default value of the property

You can just do the following:

1. Get rid of updateMyVar function:

   class MySampleClass: SampleReference(){
       var varToBeUpdated:String = "my string" //var in class scope to be updated
   
       override fun sample(context: Context, intent: Intent){
           //here i need my varToBeUpdated with new string
           runSomeThing(varToBeUpdated)
           //some work to be done here
       }
   }
   

2. Update varToBeUpdated property directly:

   val myObject = MySampleClass()
   myObject.varToBeUpdated = "new string"
   myObject.sample()
   

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Update: If you call brReceiver.onReceive(...) the values in DownloadBroadcastManager are updated. But you shouldn't do that. The Android framework calls it for you. And when it happens new instance of DownloadBroadcastManager class is created and default values are set. We use Intents to pass data to BroadcastReceiver, e.g. call intent.putExtra("filename", "yourFileName") when you create BroadcastReceiver, and call intent.getStringExtra("filename") in onReceive() function to get the value. Here is how to pass/get data to/from BroadcastReceiver