<p>no, don’t bother to call. </p>
<p>I don’t think the truncated paragraph is a good idea - it’s an obvious lie. </p>
<p>I think your apology letter should be fine. Rest assured, that if they were going to reject you, it wouldn’t be for only this mistake. If you were going to get in without the error, chances are you’re still qualified enough to get in. Admissions officers aren’t evil. If your apology letter was good enough, you should be fine.</p>