Supersonic customer service appears to be non-existent

Supersonic's customer service has been absolutely atrocious. I have been incorrectly billed for a package which they have not delivered. I am supposed to be on 30/30 package which is what I signed up for. Multiple calls with their technicians revealed that at one point i was on 10/10 package but I was still billed as if I was on 30/30. I have sent emails and they have failed to respond to a single email I only get those automatic replies.

Willing to take a hit on my credit score and make sure they do not receive this payment until they contact me and resolve my query.

I am at the point where I will buy myself out of this contract and move to a service provider with better levels of customer service.