I suggest using a template. then refine it. make it understandable. remove jargon that does not apply.
if you keep the customer’s email address. what are you doing with it?
if you keep the address. what are you doing with it?
at the end of the day they can be extremely hard to read and understand so you want something that covers all your use cases but is not so complex someone could complain that it is not “clear” enough to be useable by the general customer.
If you go the template route rather than engage a lawyer to draft for you, ensure it’s a template provided in accordance with Australian legislation and requirements. There are a few out there with affordable options, one I refer clients too is at https://legallyshalini.com.au/shop/ – These templates I know to be drafted by an Australian lawyer that practices predominantly in contracts and agreements, aimed at small businesses and at reasonably pricing.