Paytm — Received wrong product under the order no [protected]

Website:

Paytm.com

I ordered on whey protein gold 5 lbs but got 2lbs instead with different invoice inside the box on 3rd may. Now when i cancel it through the paytm app it's showing an error message ie return /replacement error.

I already complained it on the paytm customer care they told me that it will be resolved within 24 to 48 hrs of complaints being received but still they neither resolved it nor give me a phone call. I want my money back asap.