In hindsight, it seems that for help to ever come, you must plant the Poloniex Magic Beans. After learning how to plant their Magic Beans -- which takes effort -- you can hope for your issues to be eventually addressed, but probably without notification, contact, email. You just check, and your $4000+ worth deposit might be released within maybe a week.... But trust me when I say that Poloniex observes all Holidays and Weekends)

*For Polo's Magic Beans (mentioned above):

1a) You must go through the unfair but necessary effort of registering a new account with a new service, The Poloniex Support Service.
1b) That account must have the same email address-username of the Polo account you are having problems with. You "cannot" hope for help by using a "linked" account.

2a) You have to open a Support Ticket (Duh).
2b) But , again, you had better NOT do it from one of your "linked" accounts. They will ignore you until you ... well ... Duh.

3) After filling out the Support Ticket, you'll problem might be resolved within one business week. But they likely won't even say anything to you. You'll check your deposit status, and suddenly find that it is now available, without any form of communication from Poloniex that it is available.

Why don't people plant the magic Polo beans to get the needed Support response? Because of the apparent difficulty of the path, which is juggling double the amount of accounts with usernames, passwords, Two-Factor Authentications. etc.., quadrupling the amount of effort to address a problem.

However, that is very little compared to the distress you will go through if you don't plant them. In that case, you will then have to wade through the Pit of Poloniex $Hell, as you lose trading opportunities at (1 / Speed of Poloniex Customer Support). Now the speed of Poloniex Customer Support is approximately:

1/c

(No, that isn't a truncated Bitcoin address. That is one (1) divided by ( / ) the speed of light (c)...)