Try cancelling your service with Telkom

I have been on the phone for 50 minutes this morning trying to find out if my cancellation request has been actioned at Telkom. I emailed Telkom on 23.02.15 and attached a cancellation request on letter headed paper as per their request. I received an auto acknowledgement and nothing else. I received an invoice in April which covers part April, part May and it included costs for the cancelled services so obviously I want to know if Telkom received the cancellation? So far I have been transferred to 5 different people and waited ten minutes before each of them picked up. What a joy, can anyone help?