You are in a financial bind at the present time and you are going to need the services of a lawyer, one who specializes in and knows his/her way around ODSP legislation, particularly practice, procedure and an excellent working knowledge of tribunals. Unfortunately, lawyers cost money, but unless you pursue this matter, you will wind up on welfare ( Ontario Works ). The amount of money that ODSP is claiming appears to represent all the monies that have been paid to you. My understanding of how ODSP works is that if you have either been overpaid or in receipt of monies unbeknown to ODSP or have received a settlement as a result of your disability, these monies will be deducted from your monthly ODSP payments, perhaps at 20%. I am certainly not aware that ODSP payments cease because you are in receipt of a lump sum settlement. I have to believe that this situation is not an uncommon occurrence and I think that somebody at ODSP has screwed up.
I would suggest that you contact Legal Aid Ontario at your nearest office and request an interview. Arrange to meet with a representative and explain your situation in detail. The purpose of this meeting would be to see if you qualify for legal assistance. Legal Aid Ontario's mandate is to assist low income individuals by providing funds to Legal Aid lawyers who choose to take on your case. Not all legal matters are covered by Legal Aid Ontario but ODSP certainly is.
My recommendation would be to contact a lawyer of your choice, that is a Legal Aid lawyer, who specializes in ODSP matters, outline your problem to him/her and ask if he/she is willing to take on your case.. If so, contact Legal Aid Ontario and request an interview. If Legal Aid Ontario is willing to assist you, they will contact your lawyer to get an estimate of the legal fees that will be incurred to pursue your case. If Legal Aid Ontario agrees, you will be given an authorization for that amount. For example, if the lawyer estimates that he/she will bill Legal Aid Ontario a maximum of $3000, then that becomes the approved amount. When the lawyer submits his bills to Legal Aid Ontario, they will pay him/her up to a maximum of $3000.
Please remember, this is NOT a freebie. Any monies paid by Legal Aid Ontario on your behalf to your lawyer will have to be repaid by you to Legal Aid Ontario. You have 5 years to repay these payments after the last payment is made.
Unless there was a fraudulent statement made at the time of your ODSP application, or a fraudulent activity made since you started receiving ODSP, I can't see why ODSP would terminate your meager monthly payments. In fact, I have never heard of such action by ODSP.
However, to give you some more information and background, please visit the following website. The lawyer who wrote all the articles on this site is also very knowledgeable about ODSP. For a flat fee, he will give you a complete analysis of your situation and suggestions as to how to proceed.
http://www.isthatlegal.ca/index.php?name=homepage
Good Luck and have a GREAT DAY.