Here are some steps you can take to try and resolve the issue with your phone:
1. Document the Issue
- Record more videos of the screen flickering whenever it happens. This will provide further evidence of the problem.
2. Contact Apple Support
- Reach out directly to Apple Support through their website or by calling them. Provide the video evidence and explain the issue in detail.
- You can also try the Apple Support app on your iPhone for troubleshooting and to contact support.
3. Visit Another Authorized Service Provider
- If possible, visit another authorized service provider in your area. Sometimes different technicians might be more thorough or have more experience with specific issues.
4. Try a Factory Reset
- Backup your iPhone using iCloud or iTunes.
- Perform a factory reset to see if the issue persists. Go to Settings > General > Reset > Erase All Content and Settings.
- If the issue still occurs after a factory reset, it indicates a hardware problem.
5. Escalate the Issue
- If you are not satisfied with the response from the service center, ask to speak with a manager or escalate the issue within the customer service department.
- You can also leave feedback on Apple's official website or social media channels to get their attention.
6. Check for Software Updates
- Ensure that your iPhone is running the latest version of iOS. Go to Settings > General > Software Update.
7. Consult Online Communities
- Sometimes, other users might have experienced similar issues and might have solutions. Visit Apple forums, Reddit, or other tech forums to seek advice.
8. Legal Action
- If all else fails and you believe the service provider is not fulfilling their warranty obligations, consider seeking legal advice to understand your rights as a consumer.
By following these steps, you should be able to get better support and potentially resolve the issue with your phone.