every 3. - 4. stay the credited points are short of what I should get. Last time last week. I ALWAYS contact directly the hotel and do not accept, if they tell me to contact customer support as I know, the points are calculated by the hotel and its just an ugly try of the hotel to refuse responsibility

I always make sure:
- to get an invoice from the hotel with ALL amounts (in particular if the rooms are prepaid and I pay the extras at check out)
- if the check out agent ask me whether she/he can send this invoice by Email, I only leave the counter AFTER I got the Email...
- I calculate the status points I should get after EACH stay (with the E/R of the check out day) and complain directly to the hotel if the shortage is >2-3%