Hi Sharon,
So sorry you are having to deal with this. I have found that with PayPal...the nicer you are (talk slower, not blow up - not saying you did...but I have gone off on them before...LOL), but yeah, the more I act like "I really, really need you ultra intelligent people" (not saying they are not, I'm just saying I make sure to treat them as such) the more helpful they are.
Are you sending your invoices directly from PayPal? I totally agree..when I was sending PP invoices, the option to have the buyer change the type was not an option...that is ridiculous!
There are not many alternatives, but this is one recommended by a PayPal Complaints website here: (you may find some solutions to get this resolved ):
http://paypalcomplaints.org/
This is the best alternative they offer:
http://www.merchantinc.com/
It is supposedly an affordable merchant account, which everyone says we should have instead of PayPal.
Whatever you decide, I wish you the best of luck.