Bad Strut replacement?

I have a question regarding Strut replacement. We just had the front struts replaced on a 1997 Audi A4 Cabriolet. A few days after receiving the car, I heard a clunk sound at the front right wheel. Driving on the highway, I hit a bump and heard and felt a continuous vibration in the front right (for several seconds). I turned the wheel slightly and it stopped. Upon immediately returning home, I had my wife drive the car slowly while I walked by the front wheel. The wheel would rock, fore and aft upon application of the brakes. Could this be a result of a bad strut replacement due to improperly fastened parts, or is it co-incidental that something else broke in the steering and suspension area? Any knowledge would help in assessing how to deal with the garage in this matter, as they were requested to thoroughly inspect the entire front suspension and steering parts. I want to avoid them smoking me on this one. I hope they are honorable, but being educated to the issues will help to suss that out.