My Firebase count method is not working correctly

Question

I'm using Firebase to count the number of adverts each individual user watches. This part works fine, then when the user has watched 5 adverts it unlocks customizations to the app. This is my code for counting the users adverts

public void count() {

    mAuth = FirebaseAuth.getInstance();
    FirebaseUser user = mAuth.getCurrentUser();
    uID = user.getUid();

    ref = mrootRef.child("dowload_counters").child("Adverts_Watched").getRef();
    ref.child("counter").child(uID).runTransaction(new Transaction.Handler() {
        @Override
        public Transaction.Result doTransaction(MutableData mutableData) {

            if (mutableData.getValue() == null) {
                mutableData.setValue(1);
            } else {

//here I grab the int to use with my rewards, I think it could be something here causing the problem??
               count = mutableData.getValue(Integer.class);
                mutableData.setValue(count + 1);
            }


            return Transaction.success(mutableData);


        }

This is my rewards method:

public void Rewards_Stuff(Context c){

    mAuth = FirebaseAuth.getInstance();
    FirebaseUser user = mAuth.getCurrentUser();
    uID = user.getUid();
    ref = mrootRef.child("RewardsSystem").getRef();

    if (count<5) {

//this one works and registers to my database
        Toast.makeText(c,"watch more ads to gain reward points",Toast.LENGTH_LONG).show();

        ref.child("counter").child(uID).setValue("0");

    }else
    if (count==5){

//this one won't?
        Toast.makeText(c,"New button colours unlocked from the main menu",Toast.LENGTH_LONG).show();
        ref.child("counter").setValue("1");
    }else
    if (count>5 && count<10) {

//this one won't?
        Toast.makeText(c, "Thanks for the on going support gain more reward points by watching adverts", Toast.LENGTH_LONG).show();
        ref.child("counter").child(uID).setValue("1");
    }else
    if (count==10){
        Toast.makeText(c,"background unlocked from main menu",Toast.LENGTH_LONG).show();
        ref.child("counter").setValue("2");
    }
}

Why isn't it grabbing the value of count correctly?