Before you actually file a case, it’s better to give 15 days notice to the opposite party or parties. In this notice, which should preferably be typed out and ideally be sent by speed post or registered post A.D., you should narrate your grievance explaining your issue, how long it’s been, what remedial action you expect from the company and what kind of compensation you seek if any. You should keep a copy of this and all other correspondence.
You should always talk to a branch office of the company closest to where you live. This will make it easier for you to meet their representative in person if you need to.