Is it Phishing?

I received a text to my private phone number in Dec 2021, quoting a serial number I don't recognise, asking me to call a number that is not on the MYOB website and providing a web address of https://bit.ly/someothernumbers.

It all looked like a scam to me so I ignored it.   Got a follow up email offering me a $100- gift card if I gave my agreement to supply my identifying documents.   Whoa there, that REALLY makes it look like a scam.

Received two more texts, (still to my private number and referencing a serial number that I don't have access to) so I finally figured I had better check with MYOB and see if there was some substance to them.  After calling MYOB and being handballed, I spent over half an hour on the phone waiting, I got cut off.  So here I am, trying to get some answers to these texts.   Are they legit?  What client are they for?   How can I get some answers and why aren't the call centre staff made aware that many people are querying these texts / emails as they so closely look fake?   

Thanks

Angela