Constant Billing issues and no service delivery

Absolute worst company when it comes to billing and communication. Trying to secure a CPT address for my business which I was told is straight forward - take out a package, update my details and my invoice will show the new address. Done it, paid for it, none of the invoices show the address. On top of that I am also being sent an invoice for amounts they are literally creating out of nowhere. All my bills were paid from Day 1 but for some reason I have an outstanding balance which is near triple the agreed contract amount. I have been emailing them for the last 3 days and havent received a single reply or phone call. Guess they just flat out ignoring me till the next debit day to take the fund that they are *****ulently billing me for.