Bad experience

I've had bad experience with MTN every time I recharge i get sms's that I've subscribed to some stupid games i don't even understand ive now used more that 3sim cards cause of that. i called them numerous times and i didnt get the assistance the last person i spoke to said she will call the manager for me but she only hanged up the call after some time..while i was busy on the call with the 1st consultant i got more sms's and they took all my airtime...i want my airtime back.my number ***.