What did u used to purchase bitcoins ?
I linked my Coinbase account to my credit union savings account.
Without knowing any of the details about your account, I would say there is a pretty good chance that you were blocked because you sent BTC to or from either a gambling site or a DNM
No, the only place I sent
BTC was to my own wallet. (And before I read your post, I never even heard the term "DNM", which I assume is an abbreviation for DarkNet Market.)
or sent BTC to LBC, in either case in fairly large amounts.
No, the only reason I got a Coinbase account was to buy bitcoin for myself.
It is also possible that you sent BTC directly to another exchange/bitcoin service (without going to your local wallet first) and clicked "no" when you were asked if you were doing so.
No, I only sent to my local wallet or a paper wallet. In one case I sent
BTC to Coinbase so I could combine it with what I purchased, and send to a paper wallet in one transaction.
Did you ever send/receive any BTC to/from a DNM, gambling site or LBC to/from your coinbase account? if so how much was it?
No, all
BTC transactions were to (and in 1 case from), a local wallet.
Did you access coinbase through a vpn or proxy?
No. I connected directly from a Comcast or AT&T fiber connection.
However, I must admit that I didn't tell the whole story. I am very concerned about identity theft, therefore I refused to send them a copy of my government-issued ID.
I also took an action listed in section 6.4 of their user agreement that allows them to deactivate my account: "You take any action that Coinbase deems as circumventing Coinbase's controls, including, but not limited to,
opening multiple Coinbase Accounts or abusing promotions which Coinbase may offer from time to time."
I think the real reason was my refusal to give them my SSN, although they didn't explicitly say that.