My company's policy was 5 weeks of vacation after 15 years with the company. Now, after 14 years of employment, the policy has been changed to 4 weeks of vacation after 20 years. Shouldn't the long time employees be

My company's vacation policy has been 5 weeks of vacation after 15 years with the company. After 14 years of employment, the policy has been changed to 4 weeks of vacation after 20 years. Also, an employee discount for "life" was offered after 15 years of employment. That policy has also changed to availability at 20 years. It seems that the long time employees should be "grandfathered in" under the policy they have been working under for nearly 15 years. The original employee handbook does not state the discount policy or the vacation availability after years if employment. It only states when an employee can begin to accrue vacation time.