Reliance Jio Infocomm — Tricked by jio salesman. Not getting refund

Address: Kharagpur

A jio service guy came to my flat and told me my jio connection is about to expire. He said not to go for prepaid monthly payment but there is good offer if I register a new connection. It's been 2 months since I purchased the new connection. My old connection was replaced but I only used 5 months out of 6 and paid 2800. I am supposed to get refund of 1 month as well as refund for the jio router security deposit. But still I have not received any refund. The service guy tricked me to taking a new connection and prematurely ending my old connection.

I have called multiple times to customer care but they lie every time that a senior manager will call back. Jio service is despicable.