I see. Thanks for explaining. To switch from cash to margin is easy...just fill out the margin application form and fax or mail it to them. However, I don't see any form for switching from margin back to cash. This seems like a rare case; I think you should call them right away. Then I think you may have to write them a hand written letter (either fax it to them or mail it via US postal service; never use email when it comes to sensitive information). Then call Zecco to make sure that they get your letter and make sure that they act on it. I believe that Zecco won't modify your account without your permission/request in witting. Good luck!