back and forth and getting nowhere

How do you give a ZERO? Really struggling with these guys. All I am trying to do is get my card linked to an email address that I am currently using. Change my email address, as I have left the company with the old email 15 years ago. But this is way too difficult for Woolies. Six phone calls later, and I am nowhere. Even emailed them. ALL I WANT TO DO IS CHANGE THE EMAIL, SO ICAN UPDTE MY PASSWORD SO I CAN GET THE REWARDS FOR ALL THE MONEY I SPEND WITH YOU.