Standard Bank Harassment

Hi Standard Bank keeps phoning me about a Company that I use to work for called Northweb. I am not the owner of Northweb, I only had signing rights on the account, because I had to go to the bank and draw statements, etc. I have told them numerous times that I have nothing to do with Northweb anymore and I gave them the correct information where to find the owner. They sometimes phoned me up to 15 times or more a day. I was still talking to one person when the next one was phoning me already. I can't even remember their bank account number. Also when they changed the account number or password, which ever, Standard Bank removed my nr from our own business accounts, so I don't receive messages that are crucial to our business. This is harassment and I won't take it any more.