Bad service, cancellation issues

I would definitely not recommend Supersonic to anyone. We had bad service all along. Don't even bother to log a call for slow speed as no one will phone you back, they just close the calls without communicating anything. Another problem ... I have been a client of Supersonic for more than 16 months and decided to sign up for a prepaid account in September 2020. I used my own router and didn't take their offer for a so called free router. I lost my job and had to cancel the service which I did on 31 March 2022. Today only did I get an email to confirm the cancellation but the notice period wasn't for the month of April as I requested, I now have to wait until end of May for the notice period to lapse. Even though you ask them to cancel on a specific date, they will override whatever you request just to get another month's money out of you. They also mentioned a claw back fee which wasn't mentioned when I initially signed up. Why is it called a prepaid service if you have to keep the contract for 24 months or else pay for the installation/activation? Please don't sign up with Supersonic as you will regret it.