Not being funny mate but why are you scrimping on tyres ? Especially on a car like that ? As I was taught years ago there are only 4 points of contact between you and the road you why cut corners on them ? If you can't afford to run and maintain the car properly - then you can't afford the car.

You may have a justifiable complaint with regards to the item - fair point - but why use second hand tyres that you don't know the history of ?