Upon employment I was issued a letter signed by the General Manager advising me of a Retention Incentive which would be paid to me by April 2015 (or sooner) upon completion of Electrical Phase One of the project (milestone SC14). It stated that I would lose the incentive should I leave the project for any reason. I have stayed on the project. Although the project has not reached the milestone due to client delays, I have been terminated (3 March 2015), thanking me for my hard work and commitment. I have been advised that I will not receive the Retention Incentive. However, the company has since sent me a Settlement and Release Agreement to sign to receive an ex-gratia payment of $10k, half of the Retention Incentive?? I don't consider this to be fair and just business and wondered if I have a valid claim to the full Retention Incentive of $20K under employment law?