Credit revoked; please help

I had an online transaction on my Venture MC declined due to suspected fraud and my account was suspended until I could send my last three most recent bank statements. My progress:

--Bank statements sent (from my Fidelity Cash Management account)

--Statements rejected because the statements were labeled as Investment Reports

--Called Fidelity to ask for a letter to send to C1 saying these ARE bank statements

--Fidelity said they can't do that but the fine print on these reports says STATEMENTS over 10 times

--Sent email to richard.fairbank@capitalone.com with this information and screenshots of the fine print, asking them to remove suspension

--C1 called my husband's phone twice (once while I was out, the other at 6am my time which went to voicemail

--I called C1 back and they said my credit was revoked due to their inability to complete a verification. I told them that's why I'm calling them back; they said sorry, it's too late.

I also have 89K miles in suspension as well as an inability to use this account. What are my next steps? More C1 escalation? CFPB complaint? Thank you kind Redditors.