Supersonic worst internet provider

I received an SMS that my line has been suspended. I have been struggling to sort my account with supersonic for a year! Every month I queried the outstanding amount and I have sent proof of payment. I have tried getting through to the call center with no luck . Holding on for 30minutes to get to call number one only then to be pushed back to number 50!! How is this possible. I requested a call back and no one has gotten back to me. I sent emails with no response. If I am in arrears for 30 days how do you suspend my account?? I don't owe supersonic any money .