An email to IHG typically results in prompt posting of any missing welcome amenity points -- as an "adjustment -- no phone call needed!
Recently, 3 of 4 award stays posted normally, and points for the 4th stay posted within 24 hours after I used the IHG website to submit a request for missing points.
More disturbing was an actual charge to my credit card of $28+ for an award stay, which apparently was to be reversed, but hasn't. Still working on that.