Client modified my design in Ai

Hi there, I was hoping to get an opinion on this matter; I'm busy working with a client to design a logo for their brand, and they chose a logo that I personally design but after a few weeks, they've come back with a modified version of the logo (specifically the icon) that they put through Ai. As a designer how would you feel if a client did this to your work without even consulting you? Also, does this not come into conflict with intellectual property or copyright issues?