Another mess up with Vodacom

My second review in the last 3 months and still not sorted out.My last complaint was about the lies sold on the upgrade package which I never received.I cancelled the upgrade and went into the store and upgrade my one contract and cancelled the other.I sent through the letter to cancelled and in the 3 December i recieved an sms ro state the contract was being converted to prepaid.That was all well and good until early this month I received a January bill for both my contracts(including the now prepaid one)I called customer service and was advised someone would contact me....3 weeks later I am still waiting for that call.I called again this morning and still no improvement.I am told to wait to be contacted.