Reliance Trends — excess payment for exchange

Address:

Chittoor, Andhra Pradesh, 600091

Sir,
I have purchased 2pant and 2 shirt in offer price of rs 889 (Iers 999 *2). But one of the set was not in correct size. So i when for exchange, i was told by cash counter girl that if i what exchange i have to bring the both the sets for exchange. If not i have to pay rs 100 more, even though i purchas at the same rate is rs 999.
As the other which i purchased was already used by my son. I was forced to pay rs. 100 and exchange the set. This i felt that i was cheated as i exchanged the set at the same price i brought the first one and i was fined for the exchange.
I what bring to your notice that this kind of attitude will redeuce the customer faith.