I was permanently banned 2 years ago after selling some expensive coins (all PCGS verified). They also banned my family members by association. (seller accounts, I could still buy)
Called/emailed/chatted about 100 times over 2 years with zero luck. Its a back office with no way to reach I was told.
Then one day I found a sympathethic rep who agreed to email the back office on my behalf.
A few days later I received an email from said office saying they couldnt let me back on.
Emailed them back quickly with my arguments, and a few hours later they let me back on!
Lesson is, be persistent.