not making payments I sold my ranch on a contract for deed, however the people…

not making payments
I sold my ranch on a contract for deed, however the people purchaseing the ranch have written me 2 bad checks and have falling behind 1 month on the second down payment amount. Do I need to seek out a lawyer to have them removed and void the contract or can I do this on my own? And if I can how do I proceed to do so?

defaulting on payment in MTA My divoce was final on 09/16/05.

defaulting on payment in MTA
My divoce was final on 09/16/05. In the termination agreement, my X is suppose to pay me $500 a month for some credit cards. He has made his girlfriend ”general power of attorney”. They said they will not pay, because I owe them for other unrealated things, and are deducting these things from the amount owed to me every month. Do you think I should take him to court for non-payment Per the MTA agreement? I do beleive that these people will just keep thinking of things unrelated to deduct. The total amount that he has to pay is $19,000.00 over 38 months. Please advise. Lynn