Not happy at all!!

My mom passed away last year July and was a customer at this bank. I submitted her death certificate early August before her funeral but have been getting calls from Capitec from different people asking me the very same thing I have told them. I also went to the Hillcrest branch to submit a letter from my attorney requesting the balances on the account and they said they will call me once they have it. I submitted in November up until now I haven't heard any feedback, how long does it take to check the balance on the system in this bank and why is the system not updated when they keep on calling me and I have to tell them the very same thing that my mom passed away. What kind of a bank is this????