Received a text saying I should download the Optus Mobile App, with a link. Did not click the link or respond, very suspicious.

got sms saying to confirm your order request today ordered by Rhea is now in progress ref#ah-1730-kwx. nstay tuned for updates as items are completed.
No idea what this is

Received an SMS from this number out of nowhere saying "This is to confirm your request today ordered by Norman is now in progress ref# ab-1703-fni. Stay tuned for updates as items are completed." no clue who they are, I haven't ordered anything. Worried it's some sort of scam. Tried to call the mobile number and I just get the Optus machine saying the numbers disconnected.