When our factory rep arrives to your appointment, they will go over our National Promotion in full detail and provide you with the best offer that is available.
When confronted by an unsatisfied customer who is demanding a discount, we would like you to respond in the following manner:
"Our company policy does not allow any discounts after the sale, what we will do is make sure that you receive everything you paid for and we will do much better going forward if and when we need to service your product which we are committed to lifetime".
No one should say " I don't have authority to offer you a discount" since that only implies that someone else does.