Misleading email saying phone was paid off

I got an email last week and the subject line was "You did it! Your device is paid off."  I was surprised because I thought I had a few more payments left.  I looked at my account and it showed 3 payments remaining.  Looked at the fine print in the email and it essentially said if you upgrade your phone, trade in the old one, start a "device payment plan" and add a Mobile Plus line, then we'll forgive the last 3 payments.  Really Xfinity?  This is the kind of crap that gives Xfinity a bad name.  If the email subject had read "An exciting offer from Xfinity" or something similar, it wouldn't have been so misleading.  Oh well...