Idea Cellular — Complain about the unwanted gamepind subscription without my consent

I recharged my phone for talktime 20 since I had to send messages to the bank but I got deducted with 15 for this unwanted gamepind, to which I didn't subscribe to or ask for it, without any consent from me. This is the second time this has happened. I know it's isn't a lot if money but imagine doing this to hundreds and thousands of people. I tried unsubscribing to it by sending STOP TO 155223 but nothing has happened.