The end of the line for Cell C

I have received appalling service from Cell C in Centurion today which left me in ore with disbelief, I even asked Christo the assistant manager if this was the best they could do as a conglomerate (Cell C) and he said yes. I entered into a contract with Cell C on the 29th of April 2016 and before the culmination of the year 2016 I encountered problems with the Sony Xperia C4 which I received on the contract, I sent it in for repairs which were elongated and I complained about the poor service on the 15th of December 2016 titled "Cell C Lengthy repairs on a Sony Xperia C4". The same mobile phone gave me more problems not detecting the sim card which I struggled with for a while until I sent the phone in on the 24th of July 2017 for repairs,the first problem was that I had to go to the Cell C shop today on the 22nd of August 2017 almost a month since I sent in the phone to find out what is happening with my device they were not communicating with me at all and the numbers they gave me on the submission form were unresponsive. The feedback I received was that my phone was Beyond Economic Repair(BER) and there is nothing they can do about it, I queried what warranty requirements have I violated and it was expressed that there were none but yet I will be without a device for the remainder of the contract. There is a fee being charged on my account for the device until April of 2018, I am expected to keep paying for a service I can’t use since the sim card doesn't have a phone and expected to pay for a phone that I can’t use. I have been a loyal customer for at least two iteration of 2 year contracts with Cell C, and I fear that this is the end of the line for Cell C and myself and believe me I asked if this is the best they could do and Christo said yes more than once but still expects regular payments.