Supersonic's Shockingly Appalling Customer Service

I have been a client of Supersonic's for years. In September this year, my fibre line was cancelled without my consent, which resulted in numerous calls being made from myself to Supersonic to get to the bottom of how this could have happened. Agents would promise to call me back with feedback and not do so. I was without internet for about 2 weeks and during this time it cost me a fortune in airtime to keep calling them for updates as well as in data so that my working from home could continue. Eventually my line was restored but I was not even notified; I happened to notice it was working after checking my connectivity as I had been doing constantly over that time. I requested to be refunded for not having received a full month's service that I paid for, was given a case number and again I had to keep contacting them for feedback. After about a month, I was informed via email that a refund would be paid into my account within a few days. More than a month has passed again and my requests sent via email directly to the person who informed me about the refund that would be paid, has not responded as the refund to date has not been paid. I have been going in circles from all levels and departments at Supersonic since the time my line was initially cancelled without my consent and the service received has been appalling and unacceptable, to say the least. It seems they are happy to receive my payment every month without fail for years, yet provide such grossly unsatisfactory service, going as far as to simply ignore communication from clients. Only when I informed them that I wanted to cancel my contract, did they appear to be interested in trying to assist with providing a service that is very much due to me. I regret ever having heard of Supersonic, never mind having considered them to be my ISP. I would not recommend them to anyone ever. There are so many alternative service providers that can deliver service that clients deserve. Supersonic is a colossal disappointment to me, as this is not the first time I experienced this dismal service delivery from them.