PAYING FOR A FAULTY UPS AND NO ONE WILL RESOLVE THIS ISSUE

Im seriously at my wits end with VOX Telecom – in November 2021 I bought a UPS, it worked great for the WIFI when power went out but when we really starting getting affect with load shedding we tried to use the plug point on the device and found this was not working, it took Vox weeks to send someone out to come look/ replace it, the technician assured me it would work even though we couldn’t test it as we had power, when we didn’t have power again I tested it and it didn’t work, so I logged another fault in July 2022. We were told to send a cancellation and accept the new order (VOX:Q***) so they could replace it again with a different unit, this was done and im still waiting for this to be done. I logged another complaint to say im still waiting and was a totally different story now when someone called me long story short they couldn't really help me and I asked that they get someone who can help me to call me.... . I explained that its unacceptable that I have paid for a Faulty UPS for months and months and now we have a INCREASE coming yet I still cant use the thing properly so what am I paying for?? Honestly it is unacceptable and no one is prepare to assist me or get this resolved? Im a good and loyal paying customer??