If I was fired without cause after 4.5 months because the employer decided to bring back a previous emoloyeee, what am I owed?

Your employer is entitled to replace you with a previous employee as long as you were not terminated for discriminatory reasons and were paid adequate severance pay. Your termination entitlements will depend on your age, length of service, position etc. You can use our severance calculator for an approximation of your entitlements: https://www.severancepaycalculator.com/?gad_source=1&gad_campaignid=157991511&gbraid=0AAAAADiogpFQ4-wvF-3cF2ZJgLhGB1NTE&gclid=Cj0KCQjwwZDFBhCpARIsAB95qO28fMpWE5EHaZ6dfkglu-ZORBpQ-nO4NSLyfyu76Rk4-L4cb7W-b6UaAthYEALw_wcB