Vishal Mega Mart — denying exchange with staff mistakes

Address:

Mancherial, Mancherial district, Telangana -504208

I bought two pants in vishal mega mart, mancherial. While billing, one of the pants doesn't have barcode, so i requested to replace the pant with one with barcode. The shop was dark as there is no power, and their's no ventilation and all are sweating meanwhile in the dark the salesman replaced the pant with wrong size and in that dangerous atmosphere after waiting 30mins in the que i am frustrated and doesn't notice his mistake, made payment and went off. Later, when i went home i noticed it and the shop was closed then. Next day the shop closed as it's sunday. Later on monday, in the morning i explained the situation to the staff and asked for exchange, but the staff denied! It's so disgusting! Very disappointed with it!