Paytm Mobile Solutions — Refund issue against the order id [protected].

I have returned the item to the seller.
Item has been delivered to the seller. The seller has accepted the item. Reverse pick up no is[protected]. Paytm customer care told me that they will shortout my issue within 48-72 hours and update me.
12 days have been finished. Still no refund. Now they do not reply my emails.
Customer care no is not contactable.
No customer representative attend my call. Please help me.