One of my co-workers (S) has a person she's working on a file for. She's been working in this line of work for about 3 decades now. She knows what she's doing. She's one of the best people I know here. She's twisting the numbers and making it as easy as possible for him, but he HAS to do a certain program. That is, with his situation, the only way to get things to work.
Our company works with several other companies to do this type of work. He's a member of two of our client companies. So he called in through the one she's not helping him with, trying to get a better deal. Except that company has worse deals than the one he was going with, and the salesperson who talked to him noticed that the client already had a file with us with S as the salesperson! He came and told S about the conversation, and sure enough within two minutes, the person is trying to call S and have her try things this way, or do it that way, or what about if we do this, or how about this way? Well, no. It breaks several federal laws, or he'll owe more money, or he'll have to pay for other things he doesn't want, or various other problems with the file.
He won't give up. S has explained things to him, including why we set up the file exactly like we did (price is higher, but includes a lot of money off of it as a gift, so he doesn't have to pay for a product he doesn't want and gets the right amount of money in the end), why he can't do any other way, and has basically told him that he needs to trust her 30 years of expertise. And oh by the way, the guidelines on everything are going to change at the start of the new year, and if he wants to get this deal before everything changes, we need his paperwork back.
We haven't seen any paperwork back. S keeps getting calls and emails from him. The record was 10 a day, on a Friday when her phone message and email said she was out of the office and wouldn't be returning until the next week. He was then mad and yelled at her (I could hear it from my desk, she sits across the aisle from me) because she didn't get back to him immediately, and he was ready to move forward, he just wanted her to try out a few more things on his file first.