Unacceptable Bad Service recieved from VOX

I purchased a UPS through VOX which i received in November 2022. After about a week of use I reported that is was faulty, not switching on during load shedding. I have received zero calls or feedback from VOX to date. It is now four months later and the UPS wont charge more that 20% even though it is permanently plugged into the mains. I called to follow up this morning, 25 February 2023, and was told that they have not had stock since November and will not have replacement stock until the end of March. Why did no one contact me to advise me this? In the meantime I have been paying monthly installments on a device that is faulty. Shockingly Bad Service.