Received a vague message from this phone number, saying she was calling from swedish medical. gave a different number for me to return the call. was informed that they needed the expiry on my cc#, which was sort of weird since I had just mailed the invoice (with cc#) about 12 hours prior. So I go to give the expiry and the woman says "we need the whole cc# please." she also said I needed to pay the full $327 since it was past due, so I slightly flipped out and explained that I had gotten the invoice six days prior. Kept pressing me to give her the full cc#. I did not.