Cell C Shocking Service

I have been with Cell C Fibre for around 3 months (not out of choice - Greencom was no longer servicing home fibre and gave it to Cell C ). The amount of connectivity issues have been endless. No communication is given as to when the fibre is down or up or what the issue is. Last week I was billed with an outstanding amount, which is actually paid up. Sent CFibreSupport and email on 7 March with proof that there is no outstanding amount and did a follow up on 9 March to ask for acknowledgement that my email was received and being worked on as well as how to cancel my contract with them. To date I have heard nothing - yesterday connectivity was horrific. Cell C, it does not surprise me that there are so many complaints about you on the internet based on my own experience. Gave it a chance but now it's time to leave. Please just tell me how to do so and you will not have to deal with yet another unhappy customer.