Was sold a problem car from the word go.

I saw one of their ads for a Honda Civic CRV 2005model.l took interest as it was priced around my bugdet hence my dream was to own an SUV.I visited their warehouse was told to come tomo morning as they were doing touch up on the interior.Excited as l was l went back the next morning only to be toldthe car has been sold.l felt betrayed as l had sold my car needed to be mobile asap.Night mare of a sales agent convinced me to buy a Subaru Forrester Xt 2005 model with kilos above 208000 was given assurance the service will be done and car registration.My night mare began on that day when l took the car home in the morning the driver window just stopped working.l took back the car was promised it will be fixed fast foward the window was fixed but the job was not done properly when closing there is some weird noise l informed the salesman got no response now 3 months down the line the car started misfiring now am expected to fork out more than 20k.Really don't know what to do am stuck with a problem hence l spent 77k.Meaning its dow the drain as l don't have that 20k soo frustrated..Any advice