I think the price you were charged is about right for the MFD2 - It was a very expensive unit.
Not being funny but have you not tried 'touching' the screen to operate it?? I surprised it took you a little while to realise. How long have you had the car?
What you want and what I believe your invoice refers to is the newer RNS510 system. I would suggest that you go back to them and insist that they fit the RNS510, I know they can be bought off eBay etc but you would have the support of a factory type fit and a brand new unit if they provide it. Insist on a replacement car if they won't change the MFD2 out.
Check over your paperwork and then pop into the dealers ASAP, don't try and do it over the phone do it face to face.
Perhaps even invite your salesman to show you how it works with the touch screen features
