UNHAPPY CLIENT !!!!!!

I am a unhappy client with Supersonic. About 3 months they swiss off my wifi due to no payment, but my payments was paid up to date, after I have calls and send emails then it was sorted now we get an invoice to say that we are 3 months behind on payment. I do not know why they have an account department because clearly they do not know that they are doing or just not doing there job. When you call then they are no help what so ever want to transfer you to the account department, but account department does not even answer the phone, when you call back you keep left on the line for more than 30 min. Not happy with this company and I will never recommend this company to any one