R4 refers to payments that are 3 or more months behind, while R9 is a write-off, usually after 180 days.
Unless the payment, made 2 weeks ago, brought the account fully up to date, it's most unlikely, CTC will consider ever restoring it, no matter what you do.
CTC, by the way, is one of the worst outfits to deal with; they readily instruct their collection agencies to sue. So I'm not sure if your superior negotiating skills will prove to be of much value.