Just had the official 02 phone number call but it wasn't them. These scammers have obviously spoofed 02's number. Called to tell me, my number is special & because of Covid 19, they are offering 50% off customer's contract. They then sent 2 texts, first one was a one time security code & the second was, the code. All I had to do was give this one time code to them and they could apply the discount. After asking for her to confirm my details, she wouldn't and then put someone else on the phone. I
Said "This is a call from O2, your mobile network provider".
I'm not with O2. I told them as such.
She said "oh s**t" and hung up immediately.
This is a scam caller.
Always refuse to speak to them and call the O2 official number if you want to speak to O2.