Do Marriott purposefully withhold Rewards points for stays in the hope that some people cannot be bothered to check or to chase it up? It definitely seems this way.

I stayed in Marriotts 3 times in October and none of them posted to my account. I called the customer service and they said they will contact the hotel. 3 days later and no progression, as they are "waiting for a fax", they said call back in a couple fo days; how long does it take to send a fax!!