Pathetic Customer Service, Pathetic Billing System, Pathetic Management! DO NOT USE THI ISP

This has been the worst customers service and billing experience of all time. I've been contacting and calling Supersonic for months trying to resolve an error made by their company! I'm being charged an amount on my account which should not be allocated to me, I've been on numerous calls where they've assured me that I will receive a credit note and that my query will be sorted. And now my internet has been suspended because my account is in "arrears"! I request to get in contact with management but no one ever gets back to me. If it was possible, I'd rate them at a zero!!!!!!!!!!!!!!!!!!! I WILL NEVER RECOMMEND THIS COMPANY TO ANYONE !!!!!!! EVER!!!!!