Beware that the CC EE “shopping cart” runs thru Wells Fargo.
Any error issued when trying to make a purchase with a CC will actually charge your account and will NOT inform you of the fact.
The PayPal route seems to work correctly.
If you try a CC transaction and any form of error is announced, assume your account has been debited for that amount but EE has not received the attempted payment.
I have informed EE staff of the issue, due to the holiday it must be assumed that any adjustment will happen next week.