Worst ISP provider to deal with!

This has to be the worst ISP company to deal with! We signed up with Supersonic in Feb 2019, and to date, our account has just been a mess. The accounts department clearly does not know what they are doing as our account has never been right nor has my payments been allocated as they should. The payments are allocated to someone else's account, that's after pop's are sent to them every time I make a payment. Then you have to resend all pop's again for them to assist and try to correct your account. We've also been overcharged on our line as our account has never been migrated when our current line speed costs got adjusted. So we are still paying more for a line that is currently advertised for cheaper. They even charged us twice for September!! Phoning the call centre is just as useless as no one can assist as no one knows what is going on. I will definitely not recommend Supersonic to anyone!! Will be changing ISP in the new year.