AWAITING SETTLEMENT OF VEHICLE ACCOUNT

On the 03/09/2015 I wrote to ABSA Bank requesting a balance on my vehicle account. Absa then sent a response in November with a balance calculated incorrectly. I then emailed manager on the 30/11/2015 and received a response from Mr Nhlanhla Xaba on the same day stating that I was overcharged interest by more than R10 000 and that he will send me an updated letter with the correct amount owing once the interest was settled. Today is just 1 day short of a month and I am still awaiting that letter. PLEASE ABSA BANK CAN I HAVE THE UPDATED LETTER AS THIS IS NOW UNACCEPTABLE TO WAIT SO LONG.