car dealer purchase problem

Last year (July) I went to buy car at dealer (wife is witness) to different city (from Ottawa to Toronto). He stated that car wasn’t involved in any accident. I left deposit 1500 CAD, signed bill of sale and went home. Also made stupid thing agreeing with him that I will pay 5000 in cash and rest as certified check (not by law – found later (I am in Canada only 4 years). Bill was signed stating amount of 12000 CAD. On our way home wife told me that he did not disclosed copy of bill of sale. Called tomorrow and asked him to fax me bill of sale. Also told him that I called Warranty Company (he was selling their warranty) and warranty is not what I expected.
He didn’t want to send fax asking me to come to close a deal. I got suspicious and told him that if he does not fax bill I want to cancel deal and want deposit back. He didn’t want to return deposit so I called OMVIC (The Ontario Motor Vehicle Industry Council) and reported my case. They called him to show them bill of sale (on my request) and indeed he showed it. When I asked OMVIC to fax me that copy I found out that bill of sale was illegal (counterfeit) since he changed amount and added sentence that I agree to buy car involved in an accident and that I agree that deposit is not refundable. Still my signature looks original.
My question is: what are my chances in court. I just want my deposit back.
Thank you for your time!

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