Rip me out of 600 hundred dollars. Took my vehicle...

Rip me out of 600 hundred dollars. Took my vehicle to them and instead of fixing the problem. They made me pay for the work and made the problem worse. Plus sold me a warranty for the work, that they will not honor! Total rip off. Contacted corporate office and still cannot get someone tk return my call. Been calling for 3 weeks and no one has even contacted me.