I have worked at my company for 4 years. I applied for a promotion and received it via an announcement to the company in email and an oral agreement on the salary. Now they are stalling on the salary end and are refusing to produce written confirmatin of the salary. I have been doing the job for the past week and have already put out some of my own money. Do I have any chance of getting my money back? Can I sue them for reneging on a written and oral agreement?