bad service

i took my car for service at Action Ford in Krugersdorp on the 7/1/2022, they were under staff and the had 30 cars on that day. , I had the worst experience . they called me regarding after service call and i did explain to them the. the car was service in a rush, the return some of the part in place and my ca is currently has gas issues ever since i took it there e.g if I park the cat with 200km remaining when I start it in the morning in will show that there 150 remaining. it smell link there's gas linkage. my car was perfectly fine before I took it there.