OnePlus India — I bought OnePlus 9R mobile on 13/01/2022 at vijayawada in happy mobiles and I got this problem in 14/07/2022

And due to the problem I visited to OnePlus Authorized service center in Bengaluru actually i am from Andhra Pradesh but i am studying in Bengaluru that's why i went to this service center then they repaired it after few days and then they said from now onwards you would not face any problem by this mobile it's absolutely fine now. then after 10 days i am facing the same problem but due to completion of my exam i went back to my home town then i went to Vijayawada OnePlus exclusive service center they said we can repair it but it takes Atleast week then i said please complete it as soon as possible because my college is going to be start soon then they assured me that they will repair this mobile within a week and then week became 3 weeks i have been calling them frequently for every two days they're saying that we've ordered mother board it is in transit it will take some time its's been 3 weeks i went back to that service center and i got my mobile back and then i submitted my mobile in Bengaluru in the same service center that I've visited previously on July 14th. i submitted my mobile on 02/09/2022 (September 2nd) till now they haven't repaired my mobile i am a student mobile is necessary for me and its been from the month of July I haven't used my mobile I am suffering alot by this oneplus service centers I am 720km far away from my home and parents I've call my parents everyday but i didn't have a mobile because of them. please help with this issue