I have been trading since 95, and over a decade in futures with zero margin calls. Used a variety of brokers in both stocks and futures with no bad experiences, until I dealt with AMP compliance. With similar refusal for followup communications. It was the most bizarre "customer service" I have ever experienced in the trading world. I will not go into details, but now that I am with two other quality firms, despite the stress they caused me, I now see it as AMP compliance having done me a favor. I would rather pay a little more for top quality customer service. There are plenty of other well capitalized firms out there who will be ecstatic to have your business.