Vishal Mega Mart — Way of attending customer

I have reached vishal mega mart badaun where i bought some items i have a problem.in one of them so i replaced that item the old bill was taken from the manager of the mart then i took my replaced item and get back today another item of that products was defected so i go back to mart for replacment i told them that they have bill so i showed them online invoice they refused the bill and used abusive language. And said me to complaint online on there custumer care office and said do whatever i want to do they will not replace then custumer care officer tell them to replace they changed there talks. this is worst behaviour from team vishal...