Hi! I'm sorry to hear about your situation. It's important to be cautious when buying secondhand items, especially electronics. As for locating the person who sold you the faulty cellphone, here are some steps you can try:
1. Contact Information: If you have any contact information of the seller, try reaching out to them through other means like phone calls or emails. Explain the situation and ask for a resolution or a refund.
2. Social Media: If the seller restricted you on Messenger, try searching for their profile on other social media platforms like Facebook, Instagram, or Twitter. You might be able to reach out to them through those channels.
3. Online Marketplaces: If you made the purchase through an online marketplace like Facebook Marketplace or OLX, check your purchase history and see if you can find any additional information about the seller.
4. Local Authorities: If you feel like you've been scammed or defrauded, you can consider reporting the incident to your local authorities or consumer protection agency. They may be able to help you with further steps to take.
Remember to prioritize your safety and well-being when trying to locate the seller. If all else fails, consider it a lesson learned and be more cautious in future transactions. Good luck!