Pathetic Third World service.

Took a six week old Connex tablet back that has stopped working , has to be sent in for repairs , no clue as to how long it will take , staff refused to give me a receipt that they have it , Patience started shouting at me that if i dont like it I must take it back and come in another time , staff are rude to customers , will never buy from CNA again with service like this ,so now CNA Vaalmall has my Tablet and i dont have any proof of them recieving it ,How does that work .