Unfair billing and bad service

CellC were informed, in writing, in Dec 2014 that my bank account is no longer valid and that I would like to do a monthly EFT to pay my several CellC contracts. The necessary documentation were attached. They however still tried to debit my account and charged me R61.40 per contract because of a lack of funds. I phoned again in Jan 2015 to find out what was going on and was told to do the EFT as close as possible to the 25th and send through proof of payment which I did. All my contracts have now been disconnected due to the R 61.40 which they require me to pay and which I feel is poor service on their side as they should not have attempted to debit the account in the first place as informed. Low and behold they tried again in Jan 2015 to debit my account. I have logged a case on Feb 5 after being disconnected with no response as promised. I get transferred from one operator to the next without being helped and being promised that my case is being attended to.I phone on a daily basis. I have been a loyal customer of CellC since their inception in South Africa and did not expect this poor service from their side. I plan to cancel all my contracts as soon as my contracts allows.