Account closure and refund request

I am so sick and tired of Telkom..I am having an account with Telkom which is fully paid however they don’t want to close/deactivate the contract..I spoke to someone over the phone regarding cancellation of the contract they told me to go to their branch n then I did go to the branch for the cancellation request however the account is not closed and I got debit for what I don’t know cos I don’t owe Telkom..please assist with cancelling the account and they should refund the amount they took from my bank account.