Incorrect billing

I had a cell phone contract with Telkom mobile and my contract ended two months ago. The first month after my contract ended i was billed R100 and thereafter i was billed R 492. For the first R 100 I was told that's how much I will be billed for the benefits going forward, however they have changed it the second month without informing me. <br> I logged a complaint with them 10 days ago and i still haven't received any feedback regarding the matter. I followed up with their call centre today and i was told they are still reviewing the matter.