Shocking Service

i took my car to have all 5 tyres replaced and fitted and had my brake pads done in the front and back wheels. I drove to work the next day and heard a funny "duk duk" sound and stopped and checked all my tyres to find my front left tyres nuts are not *****ed on at all and i could ***** it off with my fingers. I phoned them and told them about what i had experienced and was told, "I tell them everyday to make sure they tighten the wheels properly." I was also asked for my number so that he can contact me after he sees who worked on my car on the cameras. I have had no reponse and i just got an apology. I feel the matter wasn't addressed properly at all and I feel if i was in a accident or if my wheel just popped off the matter would've been much worse and they wouldn't of been liable at all.