When purchasing text books for my daughter on-line...

When purchasing text books for my daughter on-line to be delivered to a local community college, they put a hold on her checking account two times each for the full price of the books, which put her account in the negative balance of over 300 dollars. Discovered this error on a Saturday evening. We live 60+ miles north of the book store, drove there on Sunday and had to meet with many people to try and figure out what went wrong. They figured out it was THEIR ERROR! but said they couldn't fix it until the next day (monday), since the person who could fix it didn't work on sundays. I've worked retail and there are ways to process credits to peoples accounts 7 days a week. It was also strange that once we got home - they had somehow fixed it. If they had waited till monday - there would have been an overdraft fee on her account. As it was she was unable to make any purchases saturday or sunday because they had all her money and more tied up with THEIR ERROR! If I could get her textbooks elsewhere I would.