Lawyers speak different than their clients. A client tells their lawyer that someone has stolen their trademark. Of course, the attorney knows this means that there might be claim of trademark infringement. Helping bridge the communication gap is really important. This is just what example of how a good competent attorney has to be able to interpret the information they receive from their client about intellectual property and other legal issues.
As an internet lawyer specializing in trademark infringement litigation, cases, registration and assessment, I hear common language from clients all the time. Personally, I prefer they way clients speak about their problems. In many ways, their description of the issue is more accurate than the legal term we label it with.
Yes, someone has stolen your trademark. Trademark theft occurs every day. And a good trademark infringement lawyer will help you get your stolen trademark back from the person who took it.