Deceased account still active 3 years later and we are refused access to it

My late husband account is still active although I have requested several times for it to be closed. It is 3 years now but the account is still much active and the bank refuses me to have access to it. They charge account fees and eat all the interest and money in that account. All requested documents were submitted and confirmed. I sent emails after emails to no help. 3 years of grief. I went to Thabazimbi branch, Mokopane branch, Melrose Arch, Mall of the South.