So you admitted to Cousins that you lied to them when you signed up for an account by claiming to be in the trade when you are not, and lied again when you accepted business to business terms and conditions, when in truth you did not agree with them. Having therefore established that you lie to obtain what you want (or to use your words are "Unbelievable!"), could it be possible that their reaction to your request for a swap or refund was to justifiably treat you with suspicion, and you have decided to reinterpret this as arrogance because you couldn't get what you wanted?
Now you have made public the case for the alleged aggrieved party, would you also care to make public the invoice number and date of the transaction along with the case details that you claim Cousins said the parts were supposed to fit? If so, I will obtain a response from them, and make that public on this forum also. Then other forum users will be able to develop their own view on Cousins in a fair and balanced way.
That is the correct way to conduct a proper discussion, isn't it?