OnePlus India — Phone not working

Address:

204; Thanisandra Main Road Bangalore - 560077

Sir, I am big fan of one plus mobile. I am using one plus 6 and one plus 7 Two days before I have updated ios, after that my one plus 7 is not working. Now touch screen is also giving problem like some corner working and in the bottom some places are not working. Finger print sensor also not working, so went to the service centre No: 204, Thanisandra Main Road Bangalore-560077. Technician checked and told me to leave the phone he need to check wether the problem in hard ware or soft ware accordingly I have to pay the money. So I want to know how this kind of problems are happening. Pl suggest me what to do. I hope this problem may resolve at the earliest.