Reliance Trends — I am complaining about the manager in reliance trends at orion east mall

Address:

Orian east mall

This is related to the response of a manager at orian east mall at Maruti seva nagar.
I purchased yesterday for about 3210 rupees . So today i went to exchange few product. And i purchased extra too today. So my bill was some 2000 change rupees. So i wanted to redeem my coupon of 500 rupees n he was not agreeing to redeem. And his response was not at all good, he was more interested and busy in his mobile phone. I was talking n he didn't respond anything n just was busy with his phone. Really disappointed.But finally my coupon was redeemed so why shud he say that it cant be redeemed n then agreeing to it.