Dear Mr. Ranjan,
Your complaint has been noted and would be resolved at the earliest. Meanwhile, we have several email ids as well to provide you solutions to your complaints. Please be assured of your voice being heard and acted upon as well.
Also, we have a special cell that will look into this matter and will get back to you on this.
We would request you to write us on email@example.com, firstname.lastname@example.org. Also, you can call us on 9223490900 for further assistance.