Unnecessary deductions

My dad who is a pensioner subscribed to mtn caller tunes and after sometime noticed airtime being deducted from his balance so called mtn to cance l this caller tune. Spoke to a consultant name Bhule and she did assuring me that there will be no deductions or smses to my dad's number. A few weeks later my dad is still receiving the sms, called mtn to removed any promotional smses on his phone, which i was told that he needs to call, but when he did call they rather gave him a code to cancel this smses which he did. Although he has cancelled this caller tune on his phone mtn is still deducting money from his airtime and sending smses to his phone. Why do you say the customer cancel stop the smses as well as the caller tune yet you are deducting money from his airtime. He is a pensioner and it's not fair for you to be taking money unnecessarily for no reason. Please stop these or refund him is money. *******