Paytm — Cash back not received.

Address:	Mumbai City, Maharashtra, 400055
Website:	paytm

I had purchased a 1 ton AC from paytm and there was a cash back offer of 20%. order no [protected]. I did apply the promo code for the cash back offer but after the order is placed there is no cash back given. The customer service says I did not apply the code but I see no reason why I would not apply the code.also this is the second time it happened with me.