Discount Voucher issue

Order #13206689
Product : Rs 100 Sahara Q-Shop Discount Voucher
Quantity : 10
Unit price : Rs.50
Subtotal: Rs.500
Code: 2480746
Order Date: 22 Apr 2014, 11:41 AM
Here is complaints
ticket number 807134 Date: 1 may 2014
ticket number 810311 Date: 3 may 2014
ticket number 824508 Date: 15 may 2014
but not resolve my issue

these coupon are not flat discount coupon
and seller not mention anywhere on listing that this coupon work on buying 600rs above product
these coupon not working for me
so that’s why i want refund my amount back