Failure to close account after payment was made!

I contacted vodacom for a premature contract cancellation quotation. Ive received the cancellation quote and made the payment on the same date. I also sent back all relevant info and completed forms as requested. After a few days a lady emailed me saying that there were no attachments on the email so I resent them, I have been trying now for two weeks to confirm that my contract is indeed closed and it is not. I cannot get hold of anyone at the cancellation department they put me on hold constantly and then the line drops.