Reliance Bigtv — error 400 persisting since 14.02.2019.

Address:

Karol bagh, New Delhi, Delhi, 110005

I am facing a signal lost problem since 14.02.2019. After trying to get help from customer care no. After 2 days they were logged complaints regarding this complaint no. 2579002. After this they did not send any technician to resolve this issue. They have installed this dabba on 8.12.2019 and charged 500+2385 =2885 against it.
Customer service is so worse. I want my money back and surrender this connection.