Wrong scholar account billed

So I wanted to reinstate one of my daughters. The accounts team advised me to settle the account and pay registration fee and first months fee(17/01/2020). After that I was told to contact the enrolments which I did. I sent the requested documents and POPs(04/02/2020). Just as we were about to finalise everything, I get told that I still need to pay the registration and first months fee as the money I paid settled the account and was billed to my other daughters account for the 2nd month(05/02/2020). Everything is currently paused as everyone that I speak to keeps telling me that they can't help me. I paid for reinstatement and it's not my fault they billed it to the wrong scholar. No one has rep**** to my emails today and after speaking to a consultant that transferred me to her manager whose phone has been on Voicemail, I still don't know what to do.