You got stuck with a person who is only interested in the sales. Customer service is always expected when you walk into a machine shop and anything less than having her attention is unacceptable. I would return the new machine, explain why, and go to another Jamome dealer who will be more than happy to help you learn about your machine with some lessons and possibly sell your older machine.
It is sad that people take advantage of others. Little does this sales person know, but word of mouth goes a long way and if you express your concerns to others, her business will likely suffer.
Don't give up getting a new Janome even if you need to travel a longer distance for it. The machine is worth every penny and the service is worth more. You will be happier with a sales person who wants your business and is willing to spend some time in order to get it.
If the new dealer doesn't sell older machines, take it on ebay. Include pics and all the info and list shipping as "additional." You can also post to sell locally; no shipping.
Good luck. Nothing like a rude sales person to rub you the wrong way!