Shoppersstop.com — First citizen black card - fraud

I shopped at shoppers stop a few days back and the billing person envisaged the up gradation to black card with which I get some discounts and also 6 other offer vouchers in Starbucks, coffee day, chroma, Uber, titan and Amazon prime . I tried using the first four vouchers, turned out to b fake and is not recognised by said companies .so I informed this to the billing person and he says, that he did mention it as May or may not work ! Really ! Why distribute vouchers that don’t work n why lure people by offering fraud vouchers ! The billing person s number is +[protected]and he works at the Orion mall shoppers stop .