Start from the official site
Open the correct Naija site yourself. Find the app link there and check the publisher. If the name or logo look correct but you no fit confirm who publish am, use the official site for browser.
If app hang when you pay
Check bank history first, then check the order for the verified site. No press confirm again just because the first screen freeze. If your money comot, keep the receipt and ask official support to trace am.
No give stranger access to your screen
If person ask you to install screen-sharing app before dem fit help, stop. Open the official help page yourself and ask how to trace the payment with your reference.