Reliance Trends — Got 3999 product. Exchanged for bigger size. Forced to pay 500 extra

Address:

Taramandal road,deoria bypass, gorakhpur

I bought products of ₹3999 where there was offer to get extra ₹3999 product from taramandal reliance trends store gorakhpur. I bought clothes for my family. Next day i exchanged few of them for bigger size and change color of same product and same price. Not even changed the brand then also i was forced to pay ₹500 extra to get change of size. They also talked very rude and very uncooperative. I even asked at the time of purchase that can i exchange it and they agreed. But next day they refused to do so