Cox Email Operational Issue

I have been having this problem for at least two months. Last nite used two different browsers, Chrome and Edge. Two computers. Could not delete only one message at a time for several messages, then log out of Cox and back in, try again and again. Been like this for weeks. Spam empty. Trash empty. 3.4 gig of 15 used. No way to put a "trouble ticket in". Seems like Cox is saying "go away kid, you botha me". I think I might after 20 years, "go away". What to do Ms/Mr MODERATOR???

Error

This message could not be moved to trash folder, possibly because your mailbox is nearly full.
In that case, please try to empty your deleted items first, or delete smaller messages first.