he isnt saying he wasnt paid he is saying the invoice came out to more then what the original money sent cost. so in the end, it cost 500 more then what it was supposed to. he credited you the 350 for the dyno time, leading you to still have a invoice of 150.
I think more people are siding with the builder because his posts are clear and we can understand them, rather then your crazy all over the place rants.