Optus does routinely contact customers via electronic options (SMS, Email, etc.) with no identifying personalisation and provides links and offers and information that way. For a telecommunications company to 'educate' its users that they should be clicking on such messages is really poor IMO. Optus even demands your name, DOB and address if you call them to enquire about a message they sent.
In this case you are however getting scam emails (which are probably more prevalent at Optus as their customers can't tell real from false). As a general rule NEVER respond to any electronic information with links etc. unless you have only that minute requested something be sent to you (e.g. a password reset). Always contact the company via a different avenue (login manually, phone, etc.)
Things to look out for (although they're getting much tidier these days) include:
1) No personalisation (i.e. Dear Sir, Valued Customer, Dear peterg - when my email is peterg AT outlook.com)
2) Embeded links
3) Requests for information updates (particularly banking details but also DOB etc.)
4) Veiled or direct threats (i.e. You will be cut off)
5) Poor grammar
6) Not expecting the email (or slightly incorrect details) e.g you're a mobile customer and they're talking NBN.
Thanks petergdownload, I have searched the Optus website and there is nothing that I can find to update information, likewise on the Optus App just regular stuff buy, change name or plan and that sort of stuff, same on Help in Accounts you can only change details, I don't want to change anything.
When I call the Number they give here 133937, same thing.