After putting up with unreasonable requests, no raises for 2 years, working non engineering tasks although i am a good engineer and getting depressed from my current job, they decide to put me on a PIP because ” the proposal wasn't done” ….the project was approved, installed and works but the proposal (1st step) they claim…was not to their liking….they also said that i do not follow their company slogans ( some bs.) should i sue for harassment ? Or what?!