Tablet was to be repaired and they lost it!!!

I purchased a Laptop and Tablet from them and my tablet just switched off for no reason,I took it to the store in August 2014. They said it would be repaired but until now I haven't got it back. When I go to the store I'm told they will check and call me but they don't. The attitude they have is so bad they just don't care. Last time I went I was told they can't find the Tablet they don't know where it is... REALLY????? I'M still paying for something I don't even have with me. I will never recommend anyone to buy at Lewis... I won't stop this till I get my tablet back and I will fix it myself. I only took it back because it was still under warranty,I didn't know it was going to be a hustle to get it back.