For those of you like me who have had accounts banned in the past, and wish to play a character again for mostly nostalgic reasons.
I had an account banned over 3 years ago with my level 60 on it, and one over a year and a half ago with my level 70.
I found a way to play both of these toons on the ptr and the insane amount of nostalgia I got from remembering my old gear and what they had in the bags and banks was awesome.
So heres what you do:
1. Link the account to a battle.net account.
2. Go to the ptr character copy page and you should be able to select the banned accounts.
3. Find the characters you wanna copy and copy them over.
4. Log on to the ptr and they should be there.
This worked for me multiple times and I had alot of fun messing about on them.