Dispute against an unjust transaction

I hereby strongly dispute the sale of my property that has just taken place today at an auction due to the fact that I already had a reasonable offer after having been advised by Nedbank to amend it, we did exactly that but suddenly 10 minutes before the auction Nedbank has suddenly exercised hostility towards my client and me ,even though the proof of funds for the transfer was provided by my client. There was absolutely no reason to go ahead with the auction because we have had the funds and the offer in place and also because by law my client has 21 days to transfer the funds as its a large amount, I therefore appeal to this weird unfair sudden decision by the people concerned.I therefore urge you to reverse that sale and continue dealing with my client.