Xiaomi India — frequently disconnecting

Address:

House no-1332 sector 29, Gautam Buddh Nagar, Uttar Pradesh, 201301

My poco phone network disconnected frequently and switch off also after they diagnosed my phone they tell me that ur something seal is broken, some employee vikas kumar in noida sector 18 service center and also don’t talk to me properly n not gave proper information i’m from army family and they doing like that its not acceptable. My phone is new and not broken i think they broke by mistake and blame on me