Poor Service

I bought a D Mart Mini DC UPS on the 16/10/2024 for R550 hardly used it because we didnt have much load shedding and when i treid to use it yesterday i was on but didnt connect to my wifi device, today i returned it to the store with the slip and the device which has a guarantee certificate and clearly states 1 year warranty and they said they cant accept the ups because they dont give out warranties.