Billed after cancellation

I filed a cancellation with Telkom in Mid September (***) for line nr *** because I was moving. Now how come I still got an invoice for November?? And on top of it all the invoice is for a ridiculous amount of R1172.41<br> <br> On the invoice it states that my initial deposit of R700 for the line installation was also refunded but I never received the money.<br> <br> I cancelled my DSL account with my ISP at the same time and they processed the cancellation no problem. I didn't get a bill or anything. How come Telkom can't process a simple cancellation?