Davis Generatior I paid to get my car repaired and its still leaking now they say something else wrong. Nashville Tennessee

In March I paid to get the hose replace to my resvoir tank because my car was leaking and running hot.  Lisa Dotson told me that they had to do a pressurized test that would tell exactly what was wrong. I paid the fee to have it all done. Well months later it's still leaking coolant but I have taken my car back several times to them since been repaired. Lisa Dotson told me that it was just left over coolant in the pan. Well today 7-5-16 I took my car back in and she say I need a water pump, upper hose adapter and seals. Well if they did the pressurize test in March why it didn't show that she said it would cost 520.00 I don't think they really fixed my car the first time. I would never take my car back to them and all these extra shop fee's to use towel that they mechanic use is a total rip-off !!! Please beware of them because every single time I've taken my car to them I've always had to take it back because something wasn't right or fixed!!! This will be the last time they get a quarter from me... 

Signed mad customer Nashville Tn