Was there an error yesterday? Received 10k points after receiving email saying I won a $5 watchback sweepstakes...

M perk points went up 10k, checked the email had a watchback winner notification for $5 first time in awhile. That only explains 5K assuming this was a mistake since I have no failed perk plastik transactions I decided not to touch that additional 5k and assumed it would be reversed later.. But still no new emails (perk plastik or watchback) and those points are still in my balance... So should I just leave and wait for them to catch it on their own, or should I contact support and inform them of this unexplained transaction?