No one at Nedbank can provide me with correct contact details!

What an impossible company to deal with! Have been trying for weeks to contact someone in the home loans department to inform them of a deceased bond holder. Thye have given me 4 incorrect email addresses that bounce back, and 7 telelphone numbers that don't exist. How come no one at Nedbank can give me a correct contact and why cant I find it on the website anywhere. I cannot contact Nedbank unless I can login but I don't have an account there. Its so frustrating and annoying.