Closing a Credit Card account during Covid lockdown

I am trying to find an email address to contact a human via email to initiate closing a Credit Card account. Very hard to find an email address at all

BNZ seem to prefer that you send them secure messages through the BNZ mobile app if you don’t want to call the 0800 number and arrange a callback.

But, if you’ve ever done substantial business with the bank they have probably given you a business card so you can email that staff member directly.