how to make a complaint

Xfinity made a change to my price locked account, how do i get timely help resolving this issue.  I called and got an AI assistant, no help, 2-hours of texting got a phone call that hung up as soon as I tried to answer, called back got an agent no history, asked for a supervisor, waiting 45 minutes and never was connected to anyone now a total of 5 hours of my time and no resolution. Should I file a formal FCC complaint?