OnePlus India — Taking too much time for Mobile Display repairing issue

I am using OnePlus 8t mobile. I faced display screen issue and visited nearest service center of one plus (seawood, grand Central, Navi Mumbai, Maharashtra).
The members in the service center said I have to submit my mobile phone for display changing and it will take 20 to 25 days to resolve my issue as the stock of display screens are not available.
I can understand if they don't have stock but they said the stock will come only if I submit my mobile. So now how am I able to do my office work or contact anyone If I don't have mobile for 25 days.
These is a very serious issue it made my mind from next time I will not buy one plus phone as the service provided by them are worst I ever faced in my life.