Marc canceled his Comcast cable service.  When the cable guy removed the Comcast equipment,  he mistakenly left behind a modem worth $220. By some mix-up, this amount was sent to a collection agency. Upon discovering the error, Marc returned to modem to Comcast, which promised to correct his account. But the mistake remained on Marc’s credit report. Because of the error, Marc had to pay an additional $26,000 when he refinanced his mortgage. Did Comcast violate its duty of good faith?