TELKOM WON'T CANCEL SERVICES - BILL ME MONTHLY

Never thought I'd be sharing my dissappointment, but where there is smoke, there is a flame. Been a customer for a couple of years. Decided to cancel my wifi and cell contract, as I am working for a service provider, I get better prices. Telkom refuse to cancel and they keep on charging me. I've got all the ticker references of cancellation requests: ***8, ***2, ***2 and ***9. I do not see why I should keep on sending them cancellation requests, but yet they keep on billing me. My account is growing and I believe they won't cancel your services, if you owe them. Well, I owe them, because they won't stop billing me, after cancellation. So how do we go about sorting this out?