Monopoly Go not paid out

I'm fairly confident that SB have just conned me out of 800 SB.

I completed the Monopoly Go Level 71 challenge this morning; I had so many dice etc. that I actually ended up on L72.

Usually these challenges trigger immediately, sometimes before I've even done them, so I checked to see if 800 had been credited. It hadn't, fair enough, but the page said I had 1 day left, so I took screenshots of the completion and the page saying I had 1 day as precaution.

I checked back 5 mins ago and, lo and behold, it's now saying "you won 500 SB from this challenge, congrats, it's closed now". Can't open a ticket on this because none of the tickets categories for what has happened - if you say "I didn't get credited", it tells you to wait a few days before trying again. I'd also question the timings, since I started the challenge much later in the day than it supposedly finished.

It seems likely that swagbucks have decided I got a bit too close to 800 and so time to close the challenge off early, and they're hoping I won't bother to follow it up in a few days time. It's a total nuisance to pick probably one of the easiest challenges going, still have to spend hours completing it, and then get conned out of the reward anyway.