*** my contact number

My heart is really heavy, am supposed to be paying R199.00 for my wife but MTN KEEPS DEBITING R621.55 FROM MY ACCOUNT. BEEN TO THE STORE, EVERYONE I MEET KEEPS DOING THE SAME THING OTHERS HAVE BEEN DOING SAME REQUEST GOES TO SHOW ITS NOT HANDLED. ITS BEEN HAPPENING FOR 6 MONTHS NOW. PLEASE HELP ME