They can't scam you unless you call it back.
Just dial 901 to listen to it then delete it.
https://community.o2.co.uk/t5/How-to-Guides/All-you-need-to-know-about-O2-Voicemail-901/ba-p/547712
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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