Telkom Mobile, what *******!

I have had an account with these *******, and after de-activating the account, the debit order still went through. I then went back to Telkom Mobile in Lakeside Mall, just to be told I have to deactivate again. Sure as hell, the next month the debit order ran again! I then put a block on the debit order at the bank, just to notice that Telkom Mobile adjusts the value to 3 times the monthly amount to bypass the stop order. I went back to Telkom Mobile, this time in East Rand Mall, did another deactivation, in October, but guess what, the ******* again ran the debit order. On calling, I got told that I cannot be helped, I have to keep on filling in the forms until my account is deactivated. This whole saga has been going on for over a year, with these ******* *****ing my money when I am not even using the sim card anymore! East Rand Mall staff at their shop is extremely unprofessional and rude! Telling me that they cannot help me and I need to call the accounts department if I have a problem. I should not make my problem theirs!!! I will never make use of these ******* again!! I will tell everyone I know about this! Telkom Mobile has ****** money from me, how many other clients do they do this with?