I'm paying on a bill froedtert Hospital, I paying ...

I'm paying on a bill froedtert Hospital, I paying monthly. This month paid on the 15 posted on the 17th. Received a call from the billing office asked are you going to pay this month! She then told me that they have no record of it! Told her when I paid it and had a conformation # also. It didn't matter to her, she told me I needed to get a copy of the bank statement. Not happy I got a copy of it. Then went to the West Bend Clinic they were nice about. She fax the paper over to billing told them to call when it was cleared up still no call! Never been late on a payment yet. Can someone answer this question why doesn't froedtert accept care credit??