Nothing - Recurring screen issue after multiple repairs

I bought the Nothing CMF Phone * from Flipkart on **th October ****.
After * days, the phone’s screen went completely blank and became unresponsive.
So, on *th November ****, I took the phone to my nearest service center (Vijaypal Telecom, Roorkee). The technician didn’t clearly explain the issue and just repaired the phone instead of issuing a replacement, even though the phone was completely dead. I have the job card as proof.

The service center returned my phone on *th November, but just two days later, the same issue happened again. This time, the technician repaired it without giving me a job card.

The third time, the same screen issue came back in December, and again the service center did not issue a job card.

The issue happened for the fourth time in March. I took the phone to the service center on **st March ****. They changed the screen connectors, and I received a job card for this visit.

Then again, on the evening of *rd June ****, the screen became completely dead. I visited the service center on *th June. They did not issue a job card this time either, and the receptionist behaved very rudely with me.

The same issue came back on **th June. I went to the service center on **th June and raised the matter with the escalation manager. Only after the manager’s intervention they replaced the motherboard. The phone was in the service center for * days. I have the job card for this repair.

Now, after **th June, I am seeing screen flickering for *–* seconds at random times. I’m worried the issue is still not fixed. Customer support is asking me to record the problem, but how can I record something that happens randomly?

This phone has been repaired * times in just * months, and the problem still exists. Now, customer care is not allowing me to speak to the escalation manager or higher authority.

I’m stuck with a device that is unreliable and can become dead at any moment.
Neither customer support nor the service center is helping me with a replacement or refund. I’m tired of visiting the service center again and again without getting a permanent solution.