Absa Deceased Estates Vehicles do not answer

Hi, my sister passed away last year and she has a vehicle with Absa. I spoke to their department last year. However I am trying to get hold of them now. Have left several messages and am on the phone most of the day to try and get a hold of them *** or ***), but they do not answer their phone or emails. And they do not get back to me regarding the messages I have left. This is really poor service!!!!! I have waisted a lot of time just trying to phone them but there is no answer at the numbers. It just keeps on ringing.