Tablets

I bought a tablet on 7th luly for my child and on the 6th of aAugust it was not working ..took it to the store toyskingdom in Sandton where I bought it they told me that they will send it to bublegum in cape town it came back after a week..I asked them what was the problem..they told me the technician didn't see anything as I got home switched it on boom only worked for 5 minutes then I took it back and asked for my refund ...the lady Monine at bublegum in cape town is refusing to give me my refund because she been quiet.guys don't buys those tablets because once it's broken you won't get your refund they will do the same thing they doing to me...Monine is the one