Ed's Auto Sales

I recently bought a used 1991 GMC Tracker from a local car lot in St. Catharines, Ontario. I bought it with a safety and 6,000 km warrenty. I have had it for 2 weeks and had to replace a ball joint which cost me $200, while the mechanic was looking at the truck I asked him if he saw anything that should not have passed a safety....the rears shocks are leaking the transmission is leaking, as well as the differential and oil pan...the horn does not work when the vehicle is running and the drivers seat was broken. I took it back to the dealer and wanted to be reimburst for the ball joint, he refused. All he would do is fix the seat. He said to come back another day and he would fix the horn, if he had time! I was very frustrated I paid $5000, and expected it to be a good truck.
I looked around the internet trying to find a copy of a safety, so i could see the details surrounding these leaks, but all I could come up with was an address for the Ministry of Transportation Ontario, I e mailed them but have not recieved any responce?
What should I do?
If I repair all the problems, can I possibly be reimburst?
I feel really stupid for thinking the dealer was honest with me, prior to buying the truck.
Please help