Did you sign and re-send the OWP? If you did, it was probably denied because you would have then been out of status when it was received by CIC the second time.
You have two options:
1. If you had already submitted medical and PCC,
before they issued your AIP...do nothing. There's a good chance that you will get DM soon, since CIC has started to pick up the pace!
2. Submit a new OWP and pay the $255 again. Because you would be eligible for the `normal' OWP, it would probably take ~ 4-6 weeks, but...strongly consider option #1.
You've waited this long; it would be a shame to pay for the OWP [again], only to get DM and your landing interview/appointment letter before the OWP has even been processed.
Good luck!