Fax or mail (certified with return receipt) Facebook a letter and state that you revoke their authorization to post electronic funds transfers to your account.

Fax or mail (certified with return receipt) Facebook a letter and state that you revoke their authorization to post electronic funds transfers to your account. Staple the certified receipt or fax confirmation to a copy of the letter. That's all your bank needs (double check me here) to reverse any transactions thereafter and assess a fine to Facebook, which will likely face a fine from it's bank as well. The matter will be resolved by next morning. When return receipt arrives, staple that to the copy as well should the matter escalate further.