Doubled billed but I only have one line

I have had an issue with VOX Telecom since February 2023 and I keep being tossed from pillar to pillar. On Thursday the 23rd of February 2023, my services got cut off and I called and reported it, I made follow-up calls on Friday and tweets. I was later notified that Vuma is the one who cut the services not them as they are issuing the line to our neighbour. Fast forward to days later without any service, a new line was issued to us as the old one was still not working. That being solved, a new nightmare arose.

I am now being bil**** twice for these two lines. I only have one line working at my premises but to my surprise I am being billed for both. I have called them and gone to their offices with no luck. I was told flatly to pay for the two lines as the fault was on Vuma Tel and not them. What surprised me is that I do not have any contract with Vuma, so how do I raise the issue of double billing with them? I am so frustrated and angry!!!!