Who is the MMP rate for?

So I check in at a I booked hotel using the MMP rate. The manager said that I can not book with the “explorer” rate because I’m not an associate so she just changed my rate to MMF. Mind you she also called my mothers job and they also verified that my mom is an employee there and that I am Elgible for the MMP rate. The manager still kept it as family friends rate and left.

Not once did she talk to me herself she just had the front desk associate relay messages. I’m actually horrified and embarrassed that I’m being treated this way with no care in the world! Mind you I and Platinum Elite if that even matters to them. What can I do?