Xiaomi India — mobile redmi note 6 pro fail to detect sim & wifi network

Address:

BOUDHIK SAMPDA BHAWAN, PLOT 32, SECTOR 14 DWARKA, New Delhi, Delhi, 110075

I purchased redmi note-6 pro on 06/04/2019 through flipkart online website. Since 17/05/2019 mobile fails to detect sim card & wifi network. On 17/05/2019 evening i visited mi service centre located at uttam nagar, delhi, they did technical inspection and told that mother board is damage and it is out of warranty.
Then i contacted mi customer care [protected], he suggested to perform some technical check on my handset through ussd code but problem was not resolved and further suggested to visit service centre so that they can replace my motherboard. Next day i visited mi service centre at janakpuri near westend mall, delhi, they charged rs 118 and created job sheeet with job id wxin[protected] and inspected the handset whose description ia as follows: sim tear are not in sired or most of the time sim not detect. Also some scratches is front and back, data will be deleted.
Note:-liquid and damage are not consider in warranty as claimed by service centre
But the fact is handset is not damage at all, there are no scratches on the mobile body as such. Hence service centre fault description is false.
They should consider my handset in warranty.
I request to help and kindly register my complain and take needful action on this matter.