PTron — Refund not received

Address:

Mumbai

I had purchased pTron earbud. Within 3 months the problem with volume started in one of the earbud. I raised a complaint at their customer service. They were quick to respond and after verifying bill and photos they asked me to send courier earbud at their service center. Once they received it, they gave me option to buy a new pair of earbuds and get a refund for old one.
I purchased a new ptron earbud but refund is not yet given by the company. I have been mailing them as well as tried to call them on their phone but no one answers their phone. Right now I am stuck for refund.