Worst service ever

Most disgusting service ever I purchased a Dixon 10.1 HD tablet from this store. The first one I got, while setting it up for my 5year old as n Xmas gift. It froze up and then gave me a black screen indicating that you gave to reset to factory settings. I then thought ok let do this again. after the 3rd try I too it back to the store where they exchanged it and gave me a new one. So yesterday I attempted to do this again and again this same error pops up. But this time as I switched the tablet on. Managed to get it on but again did the same error. I then took the tablet back to the store. Where the same lady that helped me on Monday told me in my face I'm lying. I cannot give a tablet to my Daughter to play her educational games on and you have to reset to factory settings every second play. I asked the Lady to please return my money so I can get my daughter another tablet that actually worked. She refused. I want this **** sorted out and i will not leave the tablet with you to "repair" I paid for this and I did not have an issue until she told me I'm lying. Myself and my family support Cash Crusaders on a regular basis but with this **** and no assistance from Northcliff I will not be supporting you what so ever.