Your blinkered Buster.. I do know what i'm talking about , and if you did you would not be here asking advice on how to shaft a builder..
I often over order S/H mats so i can use the best of the load and then send back what i'm not happy with..
A price is a price. As said before if the guy was short , no doubt you would say hard luck mate!!
That wasn't the case in this circumstance he admited he had miscalculated as I informed him there are 60 rosemarys to a sqm and not 80. Not my fault he's no good at maths.
You are very wrong about your last statement as well I actually went out and bought materials for him.