How to handle a double broker
I agree with loaders as to allowing the actual carrier to deliver the load. Perhaps you can speak with the consignee's receiver and ask him/her to identify the delivering carrier, as well as fax you a copy of the B/L.
I would allow the original carrier the opportunity to provide a compelling reason for double brokering my load, as well as not informing me beforehand, in writing via e-mail, fax, or letter. In absence of a compelling and logical reason, I would then contact the delivering carrier, inform them of my knowledge in this matter. After receiving their documentation that substantiates them as a legitimate, properly licensed, and insured carrier, ask them for the POD and their invoice, the amount to be the same as I originally booked the load for. Then I would inform the original carrier of my decision, and terminate my relationship with them.
By doing this and not making any additional profit or windfall, my hands stay clean.
I hope this helps, and please let us know how you make out.