Howdy!
Being in the customer service business myself, I always find it amusing (and disconcerting at the same time) that any vendor would tell a customer some of the things I have heard here. These folks need to be reminded who pays the bills. I recently went to a seminar at Disney in Orlando where the service motto is: "It's not our fault, but it is our problem." How easy would it have been just to say: "Let me fix the order. Would you like to order anything else while we are speaking?" Customer service, plus the opportunity of another sale!
I am also into muscle cars and have a '70 Mustang. Talking to the parts vendor "tech-lines" or customer service is a beating. They are kids whose goal in life at this time is to make you feel stupid. Not all vendors are like this, but some are.
What business is missing here is that customer service folks need training in how to speak with customers. It is not enough to be a nice person. They need to know how to support, empathize, apologize correctly, and sell. When a customer calls, it is not an infringement on your time, it is your job to do the right thing. And get a reminder from time to time on who pays the bills.
Regarding Dixie specifically, I have bought from them several times and have never had a problem. Maybe I am lucky.
James