Puma — Product return but Partial refund received

Website:

in.puma.com/in/en

I had purchased more than 20 caps from puma online. But 2 caps from that was not suitable for me. which was returned back but they have refunded less than a half amount of refund.
the said return item discounted rate is mentioned 1298/- for 2 pc.
I got 25% extra discount in promotional offer i.e 1298/- less 25% = 973.50 for 2 pc.
Both cap has been returned back and amount of 973.50 should be refunded back.
But I had received only 462.41 refund.
511.09 is still pending for refund.
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