Lenovo — Laptop motherboard problem

I have raised a complaint on March 22, 2021.
My laptop was not working suddenly so I have sent mail to Lenovo customer care. They suggested to go authorized service center near by.
I have gone to service center in Madurai. But they are saying like mother board problem and not to service that laptop. So again I sent mail to cus care. They are asking to pay Rs.1770 for onsite service and I paid the same on April 27, 2021. After that engineer checked the Laptop said like there was issue for serial number so he updated the serial no. He asked me to reboot the OS since he does not have a OS at that time. I was tried to reboot the OS I faced the same issue. Then I am waiting for long days then not reply from Lenovo customer care side. Again I wrote email to cus.care then after long time. The engineer visited my home yesterday and checked the laptop then told me it was a motherboard problem now. But I raised the query to fix the motherboard problem in march. I asked him to solve the problem. He said that the lenovo team will contact me soon.

I already mentioned that it is a motherboard issue. Still do I need to wait how many days?

Details:
Name:Mohanraj
Country:in
Serial:PF0DUC6E
Claim Number:000000
Phone:[protected]
Email:[protected]@gmail.com
Preferred method of contact:phone
Issue Description:Laptop is not working now

I have attached the payment receipt also.