Hi, this is nothing about that I got banned nor about do this or that to get unbanned. I just wanted to share a piece of info i gathered for myself. It happend to me on two different account that I catched a ban for exploiting the economy. And here is what I think what triggered the ban. I was using commonly known VPN services e.g. Cyberghost VPN pay account and that got me flagged. You might ask now how I could know this? Because Blizz told me twice that I was using some sort of Proxyservice a lot of "non legit" player use. If you want to get around this type of ban especially on accounts you bought from someone else, don't use a public vpn. I had to sent Blizz a copy of the ID of the guy I bought on account from and for my second account. If it's affordable for you setup a server with your own VPN and use that instead of public ones. I've switched to my own root server with OpenVPN now, using a dedicated IP for every account and got no problems. Might change at some point, but not yet Just my experience
I would also say dont use a popular service or a free one or CHEAP, if it sounds to cheap dont get it I use a dear one and its great for everything.