File complaint against Tikona for reimbursement delay

Hi, I had taken Tikona connection in December and I had paid for 3 months advance Rs. 3893. After about 15 days I started getting connection issues and even after constantly complaining to them my issue was not resolved. Ultimately, they declared my area non-feasible. As per their policy, if a customer's area becomes non-feasible, the customer is refunded with the remaining bill amount. Everytime I call customer care they give me around 30-45 days timeline for getting refund. I've returned all their devices but still no respite. I'd like to file a complaint against them for non-payment.