Bad SERVICE (Call dropping/ worst system for Call Centre based companies etc)

We have been with Advanced Telecom CPT since July 2019 the worst move WE have EVER made as a company. Calls drops and International lines gets blocked from time to time after beinged fixed from all my sales agents and accounts department. Our Company is a call centre operational based business so you can imagine our frustration. We are losing Clients on a daily bases and my accounts department is struggling to get clients on the lines to collect funds. BUT Advanced Telcoms receive their accounts paid on time even though their deliver a pathetic service. Gary signed us up but since we having technical problems he does make contact with us or respond to emails. Justin and Chad from the Technical team keeps contacting and trying to fix things remotely. They have changed networks they have installed a bigger Arial. We have been in contact with Riley they CEO and the technical team on a daily bases but still daily our business suffers and nothing gets RESOLVED.

How can we get out of this contract that don't serve us and move back to TELKOM (whom they bad mouthed yet still use their network)

DO NOT MOVE OVER TO ADVANCED TELCOMS