Pending charge transaction on my credit card

Hi - I see there is a pending transaction on my credit card which I wish to cancel.  I have been in touch with my bank and they have advised the following:

​​​​​​Please ask the merchant to send us a Request to Release Authorization.
Email Address: card_support@westpac.co.nz
Subject Line: Request to Release Authorization.

The email must include the following:
Last four digits of the card used
Your Name
Purchase Amount
Authorization/Approval Code 310721 0042             69.99 AP R29721 
DRI*AVG Technologies  R29721 / Approve           1              $69.99

I am loathe to put my card details and name on this message but if you email me on the address on the account then I will advise the details required by the bank

Thank you
Jan

Hello Jan, 

We will help you to sort out the issue.
It isn't recommended to share account/order, personal info over this public post.
We have sent you an email to your registered email address. Please check for the email and revert back to us.

Hello Jan, 

We will help you to sort out the issue.
It isn't recommended to share account/order, personal info over this public post.
We have sent you an email to your registered email address. Please check for the email and revert back to us.