Silver tongue agents

Never buy a car from these people ****mers of note, I bought a gold sticker car from them had it financed and when I went to test drive the car had interior problems that were not there online and engine problems when I asked they told me stories that no it serviced it's normal I should not worry and and interior kept telling me no you can fix this it's not alot because I thought I wanted the car took it. But to my surprise hardly a day the car is showing EPC problem which a mechanic says it's very serious. The car car had a hissing sound I asked they said no the previous owner made a whole on the air filter but the car had a cracked pipe, I'm wondering how was it serviced from their end and how was it approved in the first place. Gold sticker car that has so many problems never be taken for a ride by their silver tongues.