Zivame — Refund of balance money in the form of zcoins

Sir,
I have ordered some items and returned the same to the zivame. Subsequently they refunded my amount of Rs.1172 in the form of zcoins to my account.
My amount of Rs.1172 balance in the form of zcoins is lying at zivame account and suddenly I got a message that my amount in the form of zcoins is expired.
Now my balance in zivame account is zero. Zivame is earning money by making people fool by way of converting the refund money in zcoins and later they are saying zcoins are expired.
I request you to look into the matter and provide me justice by refunding my hard earned money.