Trying to cancel a contract

I have been trying to cancel a contract since October by sending cancellation e-mails and making numerous calls to Telkom themselves. I've been assured that it has been taken care of but month after month I still receive invoices.<br> <br> Got one this morning again.<br> <br> I'd love for someone to put me out of my misery and help me once and for all cancel this account.<br> <br> Thanks!