Faulty parts and false warranty claims

I took my car to Benoni citi VW coz it was giving me water pump problems. They changed the water pump twice within a space of a year but it still gave me problems even after the second time. When I took it back to them for the third time with the same problem they told me I'd have to pay from my own pocket coz my car was out of warranty yet they claim their parts come with a 2 year warranty. Never buy parts from VW coz they sell faulty parts and their warranty is basically useless.