Adidas — Extra amount charged for item replacement

Address:	Karnal, Haryana, 132001
Website:	www.adidas.co.in

Yesterday i visited karnal adidas outlet sammati enterprise & purchased 2 items shoes + polo t-shirt according to ur salesman i will get a flat discount of 1000 rs. On my next item than i pick one more polo & he confirm that i can exchange item incase on any issue
Details given below
Sport shoes ba2857 size 10, 5299/-
Polo t-shirt ax6485 size l, 1999/-
Polo t-shirt ay5425 size l, 1599/-
Total amount 8897/-
After discount i paid 7897 through credit card
Today i visited store regarding exchange of item polo t-shirt ax6485 size l, 1999/-
& pick az8841 size m 2399/-
According to calculation i have to pay difference amount of 400/- rs. But the person charged 625/- rs. Even he don't ready to provide any return receipt or invoice of the same
Invoice copy attached would request you please help as they are cheat their customers