A client just paid an estimate that was sent to him over 3 weeks ago and not the invoice I sent last week for payment......?

I have a client that thinks he is right about everything and he does not make any mistakes the 14 years he has been in business, okay great he is Mr. Perfect, well Mr. Perfect decided he did not like the higher price I sent him in an invoice last week, he decided to pay the estimate in which he did not even approve! My inventory count bumped his bill up 5xs the amount I estimated him but I am not looking to nickel and dime him, I literally added $100 to cover the cost of my driver for the estimate and then made an invoice and sent it to him, explaining how much it should have been but I only charged you this amount and he seriously short changed me! Please help.