After several years of not being able to use my Avianca miles, I was able to ticket KUL-(SQ)-xSIN-(TQ)-BKK for 17380 miles in Business today.
Search online was fine, indicating +++ was ~USD18. Selection OK as well, but when getting to payment page the window indicated an issue, not to close but wait - the chat function opened up.
After initial connection, and checking the booking and my account, I was informed the +++ was incorrect and after a bit was advised it would be USD46 + USD25 'redemption' fee, making US71. I was still happy to pay this as these unrequited miles have long been a thorn in my side.
Continuing, still on the chat, I received an email link to a web payment form. After completing that the advice was that the booking would be finalised within the next few days and to await a confirmation email. Three hours later the e-ticket was received and I was then able to select seating on the SQ (MAX8) and TH (A321neo) flights. (Both had the alternate 2x2,1x1,2x2... business seating).
One thing to note during the process that I was presented with tiny (unreadable) screen shots images and the advice was to save the image and view separately.)