Deceased Estate,credit card balance

My dad had a credit card with ABSA and has since passed away. My mom and I went to the branch to report that he was deceased and they flagged on their system that he was deceased. My dad has a credit balance on his credit card. I was advised by the branch to send the relevant documentation to the credit card deceased department so that the money can be paid to the Estate late account. As advised,on the 26th April 2018 I emailed all the necessary documentation to the deparment using the email ********** I was also given 6 different phone numbers to call. However, i have not received any acknowledgement of the email I have sent and I also called all 6 phone numbers since April, the phone just rings answered or engaged. I also called the credit card customer contact number,they still gave me the 6 phone numbers that i have called before.

This is really unacceptable and so frustrating as i do not know who to contact to assist me with this issue.