I just finished a 53-night stretch at the local Residence Inn as part of a corporate relocation. I was all excited, anticipating the fat chunk of Marriott points that would help me make my switch from Hilton for vacation next year. Sadly, when I checked online I saw "0 points" as my balance. A little more digging revealed that sometime in the past I'd set my earning preference to miles, so instead I apparently got (or will get; they haven't posted yet) some DL miles instead.

Is there any way for me to reverse this? I've already changed my earning preferences, but I hope to never have this many hotel nights in one place ever again and I'd really hate to miss out on the points.