You said you got the Pell grant at school B and C, so on the FAFSA you are asked which year in school you are. Did you answer sophomore at school B (30 credits), and C (45 credits)? And they didn’t ask for transcripts?
You knew you had the balance at the first school, and you did not try and take out loans to cover it, or set up a payment plan when you left there, rather you waited until it went to collections to do something about it.
Only when they contacted you, you stopped going to school.
It also seems you changed majors from music, to engineering, and now back to music?
So do you expect to keep going to school, and get funding from the government, and not have to contribute in any way by working, and paying your debts?
There are no shortcuts, lots of people have to work hard. My kids have been working part time or in the summer, and earned $3,000-$4,000. You could have paid this off or put a sizeable dent in it by now.
I think it would be best for you to take a break from school, work, take care of your debt, and then make a plan on how to get a degree in the shortest time possible, taking into account the classes you have completed by now.
The student loans you could have taken out probably had much lower interest rates than what you can get out there from a private entity, with bad credit and insufficient income.