Is an employer required to pay vacation pay if exceptions were made to past employees?

I provided a 3 week notice instead of a required 4 week notice at the time of termination. Company stated because I did not provide the adequate required notice, I was not eligible for vacation pay according to the handbook. After handling cases before where exceptions were made to the handbook, making it an inconsistent practice of the company, I was told that no exceptions would be made in my case. I saved all my vacation pay for 11 months in the hopes of using it next year for my wedding. I had excellent performance and was a quality employee to the company. Past employees were given exceptions when it came to holiday pay and others were even paid out their vacation time at the time of required termination. The exceptions made make me question if I had reason to pursue the argument of also getting paid out my vacation.