Bidvest warranty is such a disappointment

I've took my car in at audi cause it was using a lot of oil and my claim was approved and 3 day after my engine got sorted out my gear box is malfunctioning I took it back in but now I've been told that the warranty won't cover it because I only have a limited claim of 50 thousand whereby it was used to repair the engine, the sad part when I bought the car im using I was told that the warranty will cover any mechanical faults that my rise now in sitting with no car but I'm still paying hard earned cash for it.