Nedbank's service is atrocious

My husband and I have been trying to get our tax certificate for our home loan for 2 weeks now. Every time we phone and get put through for verification, we get cut off (all 9+ times!!). In the last 2 days I have spoken to Thandi (who took my cellphone number and promised to phone me back, I am still waiting), I have spoken to Kedibone, Zoldiac and the list goes on. Yesterday my husband went to the Rivonia Boulevard branch only to find out they were offline. Today I went in to the branch, was there for more than 40 minutes to try and change my phone number only to phone Home loans now and find out that my number hasn't been changed. I honestly don't know what more to do......... I was promised by Lerato that she will notify me once she managed to update my cellphone number, but I don't hold my breath.