Disgusting customer service

Endless frustration to get issues sorted out. Last year when I joined and made my first payment end of September 2020, I used the wrong reference number. I saw this end of October 2020 and immediately called to advise and get the payment reallocated to my account. After countless calls and being told a case has been logged and will be attended to it took over 4 months. I got a mail in December 2020 from a outsourced collections company stating my account is behind. I sent all the proof and documents to him and still the problem persisted. I moved end of April and spoke to Supersonic about moving my line in which they gladly assisted and got me connected in a short period of time. End of my comes and my address is incorrect which I called and was told a case had been logged and my address would be updated. It was only changed on the 9th of July 2021. Upon receiving my June invoice I was double charged for 2 lines. I only use one and stay in a one bedroom apartment. Speak to them again a case has been logged. I then tried to change my router password. I cannot access the router. Informed Supersonic a case was logged. I have connection issues and loose connectivity. Informed Supersonic, a case was logged. When I followed up I was asked to send photo's of the lights that is on the router and the box installed by Vumatel. Again a call logged. When I followed up I was told there is no cases logged on my account about any issues. I kept the conversations and sent it to the agent and once again I was told a case would be logged. On July 6 2021 I had enough of this and requested a manager to contact me. It is 16 July 2021 and no manager contacted me as I have requested multiple times. With my connection issues calls has been logged on 13 July 2021 and was given a turn around time of 24-48 hours, this is now 16 July 2021 17:37 and nothing has happend or been done to assist with these issues. I am fed up and have requested on procedures to cancel so I can move to a more reliable ISP that would attend to their customers in a more professional manner but it was ignored completely. DO NOT use Supersonic as a provider unless you want to sit with headaches and frustration. I find it disrespectful that they do not even have any concern that a customer is upset nor thinking about leaving. The management has no regard for the customer and do not care to contact the customer if there is an issue and requesting to speak to a manager. I worked in customer service since 2002 and never have I experienced such lack of interest nor disregard for a customer. My question is if they do this to me how many other people are there that they treat like this. I have lost all faith and trust in them and would advise about thinking twice before signing up with them.