Tata Sky — Wrongly installed switch

Address:

Srinagar, Jammu and Kashmir, 190005

My tatasky subscriber id [protected].
installation area : Rawalpora Srinagar.
your franchisee: tatasky sanat nagar srinagar.
i have been using your tatasky services for last 4 years. have running multiple number of boxes at my home. recently there was an error in the signal. called the company who had installed the devices. technician says the switch installed by the technician earlier was wrongly installed under the roof, hence exposed to rains and weather problems. the switch has fused. the company is asking me to pay for installing a new switch, for no fault of mine.
if their technician has installed the switch at a wrong location, the fault lies with the technician of the company not me. the said technician has since left the company and they are not prepared to take the responsibility of the wrong workmanship. why should i pay for the wrong workmanship of the company technician.kindly take up the issue and resolve my problem.