Have you ever had this happen?

I called a broker today one I've hauled several loads for and the rate was really low.
I think it was some kind of punishment cause he stated he had a issue with a load
I supposedly declined after accepting it. something along the lines that the load
"gained" several thousand pounds of wieght between booking and time of pick up.
I don't remeber it myself and think he's mistaken me and told him so.
I consider a booking for a certian weight, count and dims to be a done deal and any changes call for renagotiation.
I have had brokers before wanting to deduct when the something changed like tarpingg to no tarp.
How say you on this?