**** advertising of UPS for wifi - **** Product

I bought a UPS online on the 13 December, Before purchasing I asked the question on how long it lasts because I bought one from another shop and it didn't last. I was assured that it lasts long especially because I only use it for wifi to work from home. I don't use it for anything else besides wifi for my phone or computer now and again. It's only been 2 months and it doesn't store energy for the wifi for more than an hr, maybe only 40 minutes. Before it was for 2 hours and it went down to 1hr-30 minutes and now only 40 minutes. I bought it with my hard earned money. This is not fair and false advertising. It was R1194 which is alot. I think they were getting rid of this stock and bad product they selling. Im so disappointed because I buy a lot from this company.