I had 51 nights at the end of my ambassador year - all 51 nights were at InterContinental hotels. Additionally I had 5 reward nights (but guess they don't count). I had staid at 6 different IC's.

I was not upgraded to RA.

I sent a couple of complaint emails - but only got some form letter responses from the Philippines. Specifically I asked about a "challenge" - stay X nights and get RA, but never got a real answer.