Videocon D2H — company providing wrong information, misbehaving and taking extra charges

I am using Vediocon d2h service.my customer id is 775753. I replaced my set-top box in Dec 18 I was not provided any bill or any other documents by company my set top box was not working properly, I raised complaint, I was told by company not to pay any amount as my box was under warranty but service engineer refused to replaced the box without charges. I called meny times to company every time it told me not to pay. Today they are telling to pay as your warranty has expired. Like that they are giving wrong informations, making us fool, harassing, cheating and earning money.