So people are having issues with Poloniex where they do not credit your money to their accounts, now, if you are sick of them, I have another solution. You can use coin base and block trades instead.
This guy right here does a tutorial on how to do this, this video helped me set up my process.
Video credits goes to the owner of the video. I am sharing it because it helped me and I feel it will help others.
Now I haven't heard any complaints about coin base as of now, so I suggest you use this method. I advise you to let people know and tell them to stay way from Poloniex. They seem shady if they aren't coming up with a solution to the problem, the are basically stealing your money