Bad company service

Hi my name is Thulani, I have been a cell c customer for more than 15 years, and it's the second time now that I get bad service from them I had my recent account on arrears and they decided to permanently deactivate my line, the I feel processes were not followed as the acc. had more than 90 days not paid and there's no one who contacted me during the period, as am doing a follow up on the matter as I made an aggrement with them around September for 2 payment, which at November they deducted an amount of R1454. 15, when I called this morning I was given diffent attorneys number which didn't have and thing on record regarding the matter, I sent and email which I was provided by a cell c consultant the gently man by the name of Sfiso had an attitude towards as I needed info"is the any issues"he rep**** and the contacts given no one was picking up the phone. The amount I made an agreement on was 2 thousand 800 and something and now when I do a follow up am told its R6041.14 when I ask I'm told it's cancelation fees which I was not informed about and also they mention penalty fees, in a space of 3months can the 2thoundsand something add to 6thousands?I need clarity on this and as matter of fact I won't be paying for an amount I didn't make an agreement on. Cell c is not treating the customers that pays their bills ok. I can be contacted on ***