Can a company charge a late fee on a late fee?

It depends on the office policies especially those on the treatment plan papers you might have signed when you first started going there :-)

yes no maybe so trentonox101

If unreasonable contact a rental association or an attorney. Amount is determined by the landlord. Not aware of any law regulating the dollar amount.Good luck.

I really dont think that there is. I had the same problem with my credit card companys. They were not happy with the payments I sent, and kept adding more