faulty handset

Saturday the 19th bougt a 110.1 tablet at game in kwt and sunday 20th it jus cracked the screen inside without falling and as I was told that it hd 12 month guarantee so went to game in Menlyn adnwas assisted by consultant called Dikeledi who had an attitude and spoke in anger wth me that t a telefunken tablet and they don't even fix it and when I told her she must check for all signs to prove that it didn't fall she said we don't take and theree is nothing I can do even it not my fault. Fail to understand that if its my fault how must I puchase at game store again