You must be running an honest ship. Most Brokers are BS artists and call it good salesmanship. It will catch them later on. A man that runs an honest business will be remembered well for just that. I have friends that ran company's back in the 70's and 80's that are still talked about how well they ran them and how well they treated their people. Don't let it get you down, if you continue to contact them that won't do business and show them it doesn't bother you, sooner or later they will come around and the ones that don't you don't need them.
When I broker loads I have my factoring companies Platinum freight brokers guarantee that the carrier will be paid in 26 days. The pay is out of my hands and I am on the hook for re-payment to the factoring company in the event that the shipper goes out of business or fails to pay. My truckload carriers will always be paid no matter what happens. It's something that I had to do as a new broker to be able to get carriers to haul loads for me. The only other way is to have 100k in the bank and offer quick-pay and fuel advance options with your own money and that is something I do not have the ability to do at this point in time. Everyone starts somewhere!