Car city service barkpan carnival mall no no

I took in my car for major service and of course there was something else that needed attention i agreed to do the extra up to my limit.cool i dropped the car off Friday picked it up on Saturday.upon collecting my car it had a sound that i can only describe as a tractor on high i called and called.i was left on hold i eventually sent an email but has not amounted touch.i cant wrap my head how does a car go into service and come out worse off.