Recurring outages + 2 missed tech appointments — need escalation + substantial credits

Hi Xfinity Support — Service has been intermittent for 10 days. A technician came Wednesday and replaced our modem, and service has been essentially unusable since. Two subsequent technician appointments were confirmed and then canceled by Xfinity at the time of the appointment. We now have another appointment four days away. I need this escalated for an earlier technician dispatch and I need the reason the prior two appointments were canceled documented on the account.