CHARGED FOR ROAMING THAT I DIDNT REQUEST NOR SIGN ANY CONTRACT REGARDING ROAMING

MTN DEBITED ON MY ACCOUNT FOR ROAMING THAT I DIDNT APPLY FOR OR REQUESTED IT BEFORE GOING TO THAILAND. I DIDNT ANSWER ANY CALLS OR SEND SMS. I WAS ONLY COMMUNICATING USING THE HOTEL WIFI. HOW CAN MTN TAKE MY MONEY FOR ROAMING THAT I DIDNT REQUEST . THEY SHOULD KNOW BETTER AND THEY SHOULD HAVE MANAGED MY ACCOUNT IN A BEST WAY BECAUSE I DIDNT REQUEST ROAMING. PRISCILLA MODISAKENG