Duplicate emails received from cox.net emails

What a nightmare. Last June I was on imap and received an email from Cox saying my email quota is at 99% and found that 4 years of my emails had been duplicated and were sitting on the server.  Only thing I could do is change to POP3 which dumped all my emails including the duplicates into Outlook, deleting duplicates form the server did not help. This is a known issue and Cox is taking absolutely no responsibility for it. Their email server has degraded so badly and since Feb 2017 they have been working to move everybody to a new server which is creating other problems.  Because of my job I can't just suddenly change my email address to gmail or whatever. Now, for the past 4 weeks I have been experiencing a lot of emails being bounced back to the senders and Cox tier 2 is basically...uh..duh, dunno anything, call Microsoft. I've been with Cox for 20 years and have always had great support and service from them but this, this is really terrible especially when tech support either really doesn't know what's going on or they lie about it. If you call in about the duplicates expect to know more than they do.