Kayla, just my 2 cents, but it sounds like they are at fault here. If his stall looked like you say, then what measures were they taking. He could have done the same thing at your home. I had a filly that coliced one Sat night at 11, the vet came out and immediately asked about surgery, I said, no. She gave her some pain meds, oiled her and left. The next morning she took a bad turn, so I hauled her to the office. They began administering fluid and more pain meds, and told me to go home and rest. About 30 minutes later, they called and said she took a turn for the worse. My dad just arrived back home and went and got her. She lived. They wanted to put her down, and I am sure glad he brought her home. Sometimes, I think vets get caught in a no win situation and really don't know what to do. I would stand firm on my statement of what I asked for and take someone (maybe Aunt B) with you to try and have the fees further reduced.
I still have you in my prayers,
Pam