Incorrect billing

I am yet again not happy with the service that cell c has provided to me, must one report on this site before they get assistance? I’ve called in more than once and all the people that I spoke to were of no assistance at all they all kept saying they are lodging a case and I’ll be called in by cell but that didn’t happen. I took out a contract in March this year of R399 which has been debuting normally up until last month where they debited me R1031.08 and now I’ve been getting sms’s saying my acc is over due and my next bill will be R1500. How does it start with R399 all the way to R1500 no more will I take up a contract with you guys because it’s problem after problem and the people at the call center are all *********** I am still waiting for the “calls” till today for someone to explain what’s happening with my acc il end up taking this to my lawyers