Hey thanks for your reply. I am only trading stocks. Some have high margin requirements though, especially for short positions.
Hmm then that is a little bizarre. Margin should not change that much. Just tell them your positions and ask why the individual stock changed. Usually this is done with an advance announcement
What I did was talk to them live. They can see your account and I showed them to check the portfolio margin on some of my calls. They could see that the margin on the calls was too high and the margin on the sold calls was also wrong.