I understand your situation and it's normal to feel uncertain about making online payments. However, it's important to be cautious and do your research before making any payments online.
Based on the information you provided, it's hard to determine if the offer is legitimate or not. However, you can try doing the following steps to help you verify the legitimacy of the Facebook page offering NC3 renewal:
1. Check the page's reviews and ratings - If the page has good reviews and ratings, it might be an indication that it's legit. However, if there are negative reviews or complaints, then it's best to be wary.
2. Look for contact information - Check if the page has a website or contact information such as an email address, phone number, or physical address. If it does, try to contact them and ask for more information about their services.
3. Check for accreditation - If the page claims to be affiliated with a government agency or institution, check if they are accredited. You can also search for their name on the official website of the agency or institution to verify their legitimacy.
4. Search for online reviews - Try to search for reviews or feedback about the page online. You might find information from other people who have used their services.
5. Be cautious with payment methods - If you decide to make a payment, be cautious with the payment method. Avoid giving out your credit card information or making payments through unsecured websites. Use reputable payment methods such as PayPal or credit card companies that offer fraud protection.
Overall, it's best to be cautious and do your research before making any payments online. If you're still unsure, it might be better to look for other options or consult with a trusted authority before proceeding.