Contract cancellation submitted months ago but they still take my money!

For the Telkom package I submitted the cancelation through MONTHS ago already and got notification that this was submitted on the 6th of April. Months! They have still continued sending bills and debeting my account. Cancelation number ***3. The cancelation was submitted because I can no longer afford this. I kept sending them emails, messages on Facebook (you get a pathetic auto response here). They have been told to STOP debeting my account and to cancel many times... But here we are. Ive had to phone the bank each time to have the debit reversed. Now the are... At random points during the month.... Using Naido.... Debeting my account for over R800 each time.... Even when I don't have that amount.... Resulting in a fee that goes off for unsuccessful debit!!!!! I'm DONE. THIS NEEDS TO STOP! All I need is for them to send me email confirmation that this has been done. I do not want ANYBODY to phone me! I've had enough of this pathetic service... Trying to steel money from people. Easy to get a contract.... But IMPOSSIBLE to cancel! Shame on you Telkom!!!!!