Sarah Geronimo, being short-changed by her management?

There’s a blind item article pertaining to Sarah Geronimo that her talent fee was being short-changed by her management? Is this true? Thus, if for an endorsement, she receives around 5M, the real contract says it's 10M. Anyway, this rumor has been circulation already in the internet for quite a long time now. I just hope that this rumor is not true and that her management will treat her with fairly.