No internet for 5 days or the connection goes in and out

Welcome to the forum. First, tell us a little about your network. What model modem and router do you have? If a stand alone modem, can you post the signal levels from 192.168.100.1? If a gateway, check your levels at 192.168.0.1 > login > Connection > Cox Network. The 75 charge is only potential charge if it's a inside wiring issue. Since it's a on and off outage, I would assume it's a outside issue.