Unable to cancel contract

<p>years ago i opened a contract with altech autopage. They overcharged and had to pay back a significent ammount of money, which never happened. Either way, i cancelled the contract, which they have apparently not done either. They used the credit i had to continue the contract. In the mean time the shop closed, and mtn bought all their customers. Suddenly i am getting debit orders from mtn for the same ammount. I went to mtn in Jeffreysbay mall and PAID R300 to cancel the contract in September. Still the debit orders keep going off. There is no mtn store near me, and it is a huge inconvenience to have to go find them to cancel a contract that should not have been active for a very long time. Please help!</p>