Nextra Teleservices — nextra refund pending since last 6+ months

Address:

Gurgaon, Haryana, 122018

My refund is pending since last 6 months. Have made so many calls and mails to the customer support but no response. Just delaying the request.
Pathetic service and extremely non-competent customer care support. Have to follow-up atleast 5-6 times for each service request. Network quality is very poor and no actions taken on complaints. Even on disconnecting, refund process is still in-progress from last 6 months. No way for escalation also. Completely unsatisfied!