Reliance Trends — invalid coupons provided

Address:

Wardha, Maharashtra, 442001

Today morning i received a message about some discount coupon in your nearest store. And they asked me to rush to the store to buy something. I did the same, and while billing, when i showed them the discount coupon, they said that the coupon was already used. Can you explain how is that possible?
That was a total waste of my time. I want you to provide better services regarding your offers.
On talking with the manager of the store he was taking our issue very lightly and was not responding to our questions.
Clearly, indicating that the services of reliance trends are not good enough.
Also, when i found customer care number from google i instantly dial the given number and then they say that this number does not even exist.