Incompetent....called to verify my daughter's tuit...

Incompetent....called to verify my daughter's tuition amount the gal told me two different amounts. Then when I went in to pay I asked them to verify all classes and credits were accounted for and she confirmed they were. I was then given a different amount then what I was given on the phone.A month later I am told I owe them more money , when I asked why they told me credits were added after my payment was made that day. The staff obviously can't read a computer screen when asked. When I confronted them on it, I got a run around , they wouldn't take responsibility for the error. They were told that they would not get a dime if my child attends next fall until a print out of everything is given to me and all classes and credits are accounted for so prevent this from happening again. I have other children who have attended college as well as myself and I have never had a issue like this.