Xiaomi India — complaint regarding worst services of mi service centre

Address:	New Delhi, Delhi, 110009
Website:	Mi.com

Sir my phone redmi 4a grey 3gb+32gb rom imei1:[protected] imei2:[protected] having some network fault. Like the handset is unable to get 4g and 3g networks. So i have submitted my phone to the nearest service centre (Durga communication 48 mall road kingsway camp gtb ngr delhi-110009).. The working staff assured me that they will resolve the problem in 5 to 6 hours.. But till now they take 3 days and they are unable to resolve my problem and now they are not picking my phone and asking for more time. So please take an action against them.
My job sheet image is available below.