Billing

I upgraded my telkom mobile contract on 1/1/2016. At the end of January I received an sms stating only R89 would be debited from my account. I contacted the call centre as my installment should be R449. The agent told me that I was being charged R89 as Telkom had credited me for the remaining data balances on my contract and the R89 was a difference I had to pay, what a bonus. Too good to be true of course. On Monday I contacted the call centre again to just confirm if that was true, this agent was clueless and said she would log a case.I haven't received any feedback regarding the case. Today I receive an electronic invoice billing me for R901 for January and February???? why did the call center agent tell me that I was not going to be invoiced for January and the only amount due was R89? <br> I called the call centre again around 11am. After stating my case with an agent my call was cut, no response thereafter.