on 27-08-2020 11:44
It's a well known scam.
Block the number and report it free to 7726.
DO NOT follow any links or enter any information.
O2 advice here https://www.o2.co.uk/help/safety-and-security/phishing-and-smishing-advice
How to block a number:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)