10-01-2019 12:31 PM
Welcome to the forum, and thank you for being a My Best Buy member! Depending on how active you are with your membership, there can be a lot of points and transactions to keep track of, and it's understandable one may leave you scratching your head now and again.
Based on the description you shared, it sounds like a $10 certificate would have been issued. This would deduct 500 points from your membership, and the certificate would remain available until redeemed or expired, which is generally 60 days. If this doesn't seem to fit your scenario, please let me know and feel welcome to send me a private message using the link in my signature below.