Damage Tablet

I bought a tablet 1 month ago and from the star it gave me problems. It switch of by it self . Send tablet in for repairs and waited 2 weeks. After 4 day's it stil does the same thing. Went back to store but was close completly. Went to Constantia branch and explaind that i want a new tablet or my money back. After having an argument with Keven the store manager he said i must leave the store or he wil call securety to remove me from store. I then called customer care an explaind what happend and they said that they wil call me back. 4 hours later and are stil waiting for a respons from Samsung.