Quote from dagnyt:
In theory you have no appeal and must accept the damage.
In practice, speak with your broker about the indecency of selling a spread that was worth a fw dollars and being forced to pay a cash debit to close. They will tell you they use market orders to liquidate. tell them that's crap. You wont win, but speak nicely and you may get an adjustment.
If you went over your margin limit, that is not your broker's fault, but they an try to treat their customers as if they were human.
Ask what they plan to do to make it up to you.
Mark
As far as I can tell, he didn't even use margin since it was a debit put spread. They can't liquidate you unless you break the maintenance margin, which is the same as the initial margin for debit spreads(check IB's website). And the initial margin simply asks for the cash to pay the debit, that's it! Nothing more. IB's margin requirements for debit spreads specify nothing about the market price (let alone bid/ask) of the legs, only the price difference between the strikes.
What they did is a mistake and unfair, and of course he can and should fight this.