Wrong Zip Code IP Address

Xfinity did an upgrade in my area yesterday, which means I didn't have Internet for about 5-6 hours yesterday. After the system came back up late in the evening I noticed that my Local Channels were not the ones that I usually get. After checking my IP address at whatismyaddress, my location changed to a city that is about 50 miles away from me. I have been on the phone with Xfinity support today and they did a software reset and and then they had me unplug my cable modem and replug it back in. This has not resolved my issue. Can someone tell me how this issue can be resolved without me restting my cable modem? I don't want to brick my modem.