Flipkart — My realme 8 freeze and rebooting automatically

Address:

Naval Nagar 3/18 Mavdi Main Road, Ahirbhuvan

I purchased realme 8 and i am facing issues on the device phone freeze and then automatically reboot and Some time display goes blank and Very low internet speed already 2 time technician visit done and rejected both time and he is asking me for video of that how should i know that when phone is going to hang and reboot i need refund...
Order id OD[protected]