how to get technical support for internet connection problems because of upstream noise ?

My home internet connection has problems every morning from 9am to 12:pm, frequently disconnected, than reconnected after some time. I discussed this issue in this forum, and post modem event log. People helped to check the cause of unstable internet connection and told me it's caused my upstream noise. I called Cox phone support, but it's too difficult to let the support technician understand this issue, he kept let me checking wireless router, and told me modem and connection looking fine, totally ignored my description of the issue.  Really feel frustrated about it.  I work at home, have to use my cell phone's data for internet connection during online meeting time.    Are there any way to open ticket for this issue?    Thanks.