Worst "Skelem" Service

Took our car in for service today at Lindsay Saker east rand, because we going on holiday in 5 days time, and when we left with the car after service the faulty engine light came on, so we went back and then they said that the manifold pressure sensor is faulty, but the car was fine when we took it in there is now no acceleration, and extremely heavy on diesel they quoted us R 2,900.00 to fix it so now we must take it back spend our holiday money to fix it and will see if the car is done before we can leave on holiday if not I'm taking this further as someone at Lindsay Saker Boksburg Eastrand does not know how to do their job are they even qualified technicians? Car goes in for a simple Service coming out Broken! From Fine to Broken?!