<p>I don't mean to harp on this, but they were legally entitled to sign your name (although they should have signified under the signature that "signed by parent for minor child"). It is not automatically illegal to sign somebody's else's name. I've done it myself and then had the signature notarized because I had the person's power of attorney. </p>
<p>Of course, the main point is that they should have let you know.</p>