What do I even do in this situation?

I got sent an invoice from REA for end of lease cleaning that was $770, I did think that the clean was reasonable as my partner an I missed a few things, the price is a lot but whatever I paid it🤷‍♀️

I emailed REA about the bond aswell as the overpaid rent that I didn’t even realise that I overpaid until I looked in the PropertyMe app, they refunded me that and told me the bond isn’t back yet, And that the cleaners are sending through 2 invoices that they haven’t received yet.

Little back story, my sister got the house and then couple months later me and my partner moved in with her and then she moved out and me and my partner stayed living there, so the bond was in her name and only stayed in her name. My sister also didn’t claim the bond back herself and just left it in the hands of the REA🤦‍♀️

I asked REA to provide full details of the second invoice including what it relates to and why is it seperate from the $770 I paid. REA told me it was because the ‘cleaners’ attended on 2 seperate days, they only invoiced after the first day only instead of both on one invoice.

I told REA again to send the second invoice, mind you not once was I given the opportunity to go back and fix this myself. She sent the second invoice of another $700, that was NOT from the cleaners, but from the owner, the second invoice also has duplicates of what the actual cleaning company cleaned. So all up they are trying to get $1500 which is ABSURD.

REA also tried claiming the whole bond and my sister now has made an NCAT claim.