Mobile phone charge after canceling internet service

I cancelled internet service for my moms 2nd home and not have been getting changes for mobile service that we never had. I called yesterday and spent a hour on phone they said yes we see you had a line but it was never activated. We wil! Credit the funds and I needed some pin to cancel the acct. They tried to send to me and it would not activate so told me to go in. I dif and two hours they could not even locate the charges or the call I made that morning. 

This needs to be resolved. I'm getting emails showing charges and you have the credit card number . your taking advantage of an older person that is not able to come in or use email etc. Thisis,a mess I'm on her 2nd acct but was not on her primary acct but for some reason after yesterday I can not see her primary information after the tech in person tried to help. This is a mess and you need to fix it

If you have the email forme and her credit card information to charge you surely cancek this acct without going in in person. Do better Xfinity.