Buy out gone wrong. Have not received payment on buy out agreement (year past due date).

I had a business with my two other partners. Things were going great till they decided they didn't want me to be a partner any more. It took me by surprise since I did significantly more work than one of the partners and was more invested too. They waited for an opportunity and aggressively blackmailed me saying that if I don't agree to the buy out they would sue me. I was so shocked by the turn of events (and a little frightened to be honest) I agreed and signed the papers for a buy out. Now it is past a year of the agreed date that I would receive my buy out money and I'm certain the business is doing quite successful now. I am so confused as to why I haven't received anything. What am I entitled to? What are my rights in this situation?