Telkom Poor service

I need assistance I have 3(x) Cellphones and a Router on contract I used to pay R921 a month on the 31March I payed R772 because my first contract finished they contact me to ask if I want another 2year contract I said no end of last month I was Billed R1511 I went to the nearest branch in Zevenwacgh Mall to enquire what the Bill as for Junaid check on their system and said I activated an open line I told him I have never activated anything I ask him where is the proof of that he said they are two different companies maybe the call center activated me so ask him to stop this open Line. Now I received a bill of R1424 and I can't buy airtime or data on my phone I came from the Mfuleni Mobile Branch now and they can't assist me they say I bought airtime worth R530. I don't understand what should I do and I want to cancel my Telkom contract please advise. Contact me on ***