request for cancellation of MY MTN wifi contract

i have been trying for the last month to cancel my wifi contract as this contract has expired in April, i requested the cancellation but i have had no feedback to date. the problem i have is when it comes to paying the contract they are easy to get a hold of but when i need the contract to be cancelled there is no one i can speak to over the phone to make sure the contract is cancelled as well as the debit order...... i have had no joy in receiving confirmation of my request. which means they will most probably debit my account this month after requesting the cancellation. i am extremely unhappy with MTN and will not recommend you take up a contract with them. i will be taking further action if this contract is not cancelled with immediate effect!!