Cell C - Extremely bad Service

I have been trying to update my banking details with Cell C now for 3 months. Emails and phone calls going up and down and still its not updated. How can it take 3 months to just update details on your system. I've had the worst customer experience ever. From empty promises on email to *********** contact centre staff that cant spell. The agent asked me how to add my initials on the system as he is not sure of you put a space, a coma, or a full stop between the initials. Managers refusing to speak to customers as they are not contact centre agents. And then finally getting a manager and she puts the phone down on me as she also cant seem to change the detail on your system. I have sent a formal email with several follow up emails for someone to go back and listen to the call recording, but as expected not even an email acknowledging this request. Sent messages on FB and got a response that someone will look into it, again no feedback. Last person told me it cant be updated because I have a double barrel surname and the Cell C system do not accept this kind of surname. She will escalate, again no feedback. Getting customer service emails promising that someone will be in contact within 2 business days. A week later AGAIN. I am not asking for the impossible. I have been a Cell C customer since the start and now years down the line you guys simply refuse to give me the service that I am paying for. This is totally unacceptable!!! Now that i have posted this on Facebook, it gets deleted immediately off their page.