As a Diamond member you MUST get access to regency if you are paying a published rate.They do not have too upgrade you on a free stay or a 50% off stay. i have always been upgraded on free or 50% off stays EXCEPT in Bangkok.They have always given me a hard time when not on a fully paid stay.Once I had 3 free days in regency and they put me in a normal room with access to regency. Anyone would think it was their money!!!