still getting bills although contract cancelled

I am still getting bills emailed to me on a monthly basis. I cancelled my contract in December as my contract came to an end on the 28th of November 2014. I got hit with double the amount beginning of January. I paid my bank a fee to have the debit order cancelled as well as have the amount debited from my account credited back into my account. I was told by my bank that I will need to go back to them in April - as Debit orders can only be cancelled for three months by the bank as the onus is on the supplier to take me of their system - in case Telkom debits my account again. This will be highly likely as I am still getting bills from them. Not sure what language to use with them as they do not understand the international language which is English. Maybe speak to them in \alien"language... this has now become a complete joke. !!!! at my expense."""