USC approved a tuition level of $57,256 for next year, which reflected a 3.5% increase over the prior year. Do you have evidence that they are charging more than that amount? (If not, your headline is incorrect.)
Edited to add; if you are not feeling the love of your new Trojan Family, try someplace else. I wouldn’t be surprised if your kid’s second choice would not be amenable to re-accept him/her.