Samsung — Samsung M31 Smartphone

I bought a Samsung M31 Smartphone through CROMA online in 2020. For the first one year it worked very well. They it started hanging intermittently. When the hanging frequency increased, I took it to the SAMSUNG authorised service centre in Hosur - 635 109, Tamil Nadu. So far it was serviced by them thrice. Each time it worked hardly for 2 hrs to 1 day. I have my datas available in its hard disk. Unable to take back up also. Seek a resolution from Samsung India. Refund / Replacement is required.