Please help! TrenItalia purchased wrong day!!:O( - Rick Steves Travel Forum

I just purchased two tickets on Super Economy the Frecciarossa train from Florence to Rome and paid 65 US dollars. However, when I purchased it, I noticed the date was 06/15 and not 06/14.. We need to leave on june 14 for rome. When I went to change the reservation, it wont give me the choice ...