Xfinity mistakenly Disabled my DVR box. How do I get it reactivated?

My Xfinity DVR box was working fine.  But an Xfinity Customer Service Representative told me he would give me faster internet speed and that I would not have to get any new equipment.  Sadly, he was wrong, because his actions caused my internet and Cable TV to stop working right before an important online appointment.  Xfinity wrongly disabled my modem and my DVR box.  After three hours of trying, a different Xfinity Customer Service Representative was able to downgrade my speed, reactivate my modem, and get my internet working again.  However, she could not get my Xfinity DVR box reactivated.  How do I get my DVR box it reactivated?  (The Xfinity rep told me to bring the DVR box to an Xfinity Store so they can scan it back into their system.  However, I cannot do that do to health issues.)

How can I get my DVR box reactivated without having to bring it to an Xfinity Store?