Thank you for reaching out to us regarding the certificates that were issued. Please take a moment to review my previous responses to this thread.
At the end of every February, tier statuses expire. If you haven't spent the required amounts to retain your Elite or Elite Status, your tier status would revert to our Core status. At that time, your banked points would be converted to certificates as our Core tier doesn't receive the benefit of banking points. I apologize if you were unaware of this.