No assistance from dealership after my car broke

I bought a 2012 model ford figo 1.4 tdci from S4 auto it had 73000 km on it , I signed my contract on the 25th of August . On the 28th September my ford broke down and had to be tow'd to ford in Boksburg. Ford itself repaired the Car as the diesel pump sensor was broken it cost R2547 to repair . My car had 85000km on it when this happend . S4 auto refuses to assist me with the costs of this repair because it broke down 3 days after the warranty expired that they gave me and also they serviced the Car themselves so now the Cars warranty plan has fallen away and I was told the car doesn't come out with a warranty plan. I think its unfair as I hadn't even paid the first installment on the vehicle and it already broke down .They say they sold the Car to me at Cost price that's why they can't assit me but I am sure I paid full price . I would just like to say they have lost a customer and would never suggest to anybody to buy a car from them