Disgusting service

Pathetic service. My mom passed away in February 2022. I proceeded to the local branch at the time and handed all the requested documents. I then went again to branch and again handed paperwork. I have been a couple of more times and still no news. Gent had left that was helping only to be told by an abrasive staff member to email or call the deceased estates department. This was done on 15th November. No feedback again then logged a complaint on their site. They then called me and advised me that they were not aware of my mother's death. They then asked again for the paperwork. Another lady then called me and again asked for the paperwork. I have again sent the paperwork. I have now sent follow up emails to the respective lady and these are now being ignored with no response. What do i have to do to get my mother's account sorted out???????