I enrolled a program from equifax company, which I can check my all scores and more details from 3 big companies. And so far, the problem only found in equifax, and I found in those 3 months(I arguing with that rental-company), it was marked as "CA". But balance showed is $0 in the credit report.
A few days ago I filed a disput from equifax, and will take 30 days to get result.
hope it can be removed.
By the way, I just found that apartment company has very bad reputation, if someone argued with it for some unreseanable charge when they move out, those persons will find themself have some bad credit report later.