Airtel — no signal coming in high frequency box installed on 08-01/2018 my reg no-[protected]

Your representative installed hd box on[protected] not given remote took away the old box charged rs 700. My complaint was that he should return excess money taken from me but not attended till now.
The hd box which was installed has stopped working today. Although i have made a complaint on your phone [protected]. I request you to attend my complaint on priority basis and up to satisfaction to me.
Thanks.