Deceased claim of the account holder

My Mother was a Tymebank account holder before she passed on. She died on the 05/01/2021. On the 21/02/2021 I notified Tymebank about the passing of my mother, they advised me to email my mother's death certificate, letter of authority, certified copy of my mother's ID, and a certified copy of my ID to '***' ever since then I did not hear from them. I called them several times to check on the progress of my case but could not get any joy, evertime I call them to do follow up they tell me they will call me back of which they did not until to date. Today I spoke to Tshepo who kept me holding on the phone for more than 45 minutes when I insisted that I want to speak to his supervisor/Manager and eventually hung up on me. This is the pathetic service that is untolerable