Frustrated when ABSA doesn't respond to communications

AVAF ***

My vehicle was sold on the 25th of March 2021 with the Fast Buy option. I have been requesting a letter on an ABSA letter head stating that this vehicle is no longer in my possession and has been sold. My insurance has been charging me and thay require this letter in order for my debit to be cancelled and payments reimbursed. I have sent multiple requests but no one seems to help me. I was advised its sitting with a person but he is not even responding. I am highly frustrated.