Failure to update details

In January, I moved to Potchefstroom & asked Std Bank (via e-mail) to change the e-mail address on my account so that I may continue to receive my ct card statement electronically. I had already by then changed my e-mail address on my internet banking profile. I received a reply that I would have to go to a branch to have my details changed, & I subsequently went to the Mooirivier Mall on Friday 1/4/2016, with my ID & proof of address, & after spending 10 minutes in the queue, asked the Std Bank employee to update my e-mail address, very specifically for my CREDIT CARD statement, as I had already made the necessary change to my cheque account via internet banking. She said that she had, & when I asked her again whether she was sure this would also change the e-mail address on my credit card statement, she became a bit annoyed and stated that 'EVERYTHING would now be updated'. Lo & behold,my credit card statement was sent to the old e-mail address again this month. I did my part, as instructed by you.I spent time in the bank, I brought all my documents, I checked with the employee, and I am NOT going to take another day's leave to do so again. How are YOU going to resolve this now?