Give it the 8 weeks - if it hasn't shown up by then, call the resort (sales department) in question. I had to do this for both NCV and OP.
NCV was an honest mistake - When I signed up for tour, I wasn't sure if I wanted points or gift certs. They put us down for the gift certs. At the end of the tour, I asked for the points instead. I got a receipt for the points but they didn't show up in my account. I waited and when I called, they said it was a mix-up from the change. They fixed it right away and the points were in my account in less than a week.
OP was a Marriott mistake, not sure if it was OP or Marriott Rewards, but points originally showed as only 1500. Since they say 8 weeks, I had to wait that time to make sure that's what it was. After 3 phone calls, OP finally straightened it out.
BTW, I always keep the slip of paper (receipt) they give me until the points post in my account - then I toss it.