In order to fix an issue we have to recreate it somehow. Can’t really draw much information from the ‘nothing works’ phrase.
Can you please install fresh opencart (we can’t because of lack of credentials to create new database) in a subfolder of http://www.bonzabuy.com.au/buy/, for example ‘ocdemo’. We will try then to apply Pavilion and install demo data to see if something breaks on your server.
We’ll have another look to the payment images. The other thread of yours is not forgotten also, it will be answered.