Nedbank call centre poor service

Just trying to obtain my tax certificate for E-filling. Phoned....hold on for 20 min, spoke to a person, I understand the authentication process but my phone does not do the pop up message. He transferred me to voice recognition, again hold on for 20 min. Hung up. Try again, again 11 min. Spoke to someone explain the pop up does not work same story transferred me. Another 20 min no answer. WHAT MUST I DO TO OBTAIN MY TAX CERTIFICATE ON MY BOND?????????????????????