Unhappy about the service

For the past 7 years i have been taking my car for service at Cassey's auto Benoni and never experienced any problems. On the 18 October 2023 I took my car for service at CHM Ford kempster Umgeni road and on the 1st of November I started hearing an unusual sound. I called the service department they asked me to bring the car. They told me that the car needs some mounting because there's something moving under the car, later they asked me if I didn't take my car to any other service providers coz there's bolts under the car that are not correctly placed. They then assumed that my Cassey auto Benoni did not put the bolts correctly. This was puzzling because my last service with Casey's was 2022 and since then my car never had a problem. Even today my car is still making noise. I sent them an email and they never responded.