No internet after cox contractor at my place. Customer support says modem is my problem

Still no internet at my house since Saturday 9/11/2021. Cox said a technician would come Sunday 9/12. No one came. Then they said one would come Monday 9/13. No one came. Then they said one would come today 9/14. No one came. No call to notify that no one would come. Again tonight I called customer service and asked to speak to a supervisor. They promised me that a technician would come tomorrow. I just don't understand how this level of customer service can exist.