Incorrect Billings

I recently signed a for 10 meg uncapped ADSL contract. On the consumer application form it stated that my monthly debit order will be for R 900. I have been charged R 1000 per month. Secondly, as my Telkom Mobile contract expired earlier last year, I cancelled it as I do not need it anymore (reference ***1). I was still debited over two month period. I was told that although they can see the cancellation on the system, someone will contact me to resolve. No one has contacted me since November.