Motorola Mobility — Display become faulty after update

I am a smartphone user of company Motorola .after the last update my smartphone display is filled with green lines.so i approached the service center due to the unavailability of authorized service center in my area i had travelled 100 km and and approached the the fortune service center Calicut they refused my warranty claim due to some dents in the body which is claimed to be ip68 which appeared due. And they sent the smartphone to the head office in Chennai and said the same.
i had sent the mail to the service center for the reason for the refusal of warranty. but the reply to the mail is not yet given
i checked the phone privately with an expert technician, after careful micro scoping he informed that there is no other problem with display
i bought the phone due to the faith in the company but it seems that my rights have been violated