I was dismissed from my job on Friday after working for this company for 15 years with the only explanation of "we are taking a new direction". I was asked to sign a termination agreement at the time where they gave me 1 month notice and a few months severance which encorporates a bonus I was entitled to. I was in shock at the time and signed the agreement. Is this something I can still change and revoke or am I stuck now with what they gave me?