Edit: You should also speak to customer service in the morning. https://www.o2.co.uk/contactus Call. Don't use Live Chat.
The fact that they knew of a previous conversation is worrying unless indeed it was legitimate.
Our advice as always is to call 202 (after all it's free) and never click on a link in a text message. you have a couple of days to then see if it is O2 but personally I would now call them to find out for sure. Between 8 and 8.30 is the best time to call.
@RJ29 I'll check what I can find around this on my end and will let you know as soon as I have more information Have you had a chance to talk to customer service after getting this text?
→ Access for You: Registration - Find out how to register for our Access for You service.
→ Want to chat with other fellow-minded members? Head to our Off-topic section for some interesting chit-chat.
→ Check out our Priority board for tickets & offers updates, and to discuss all things Priority-related!
→ Welcome to O2! - New to O2? Find out all you need to know to get started!
If you'd like to take part, why not register?
@EmilieT Certainly the number 0800 111 6121 is legitimate as shown here on this thread
However it has caused concern on numerous occasions. Check out this google search....
So you can understand why people are concerned when we are open to so many scams
Veritas Numquam Perit
@RJ29 If the text is legitimate, which it appears to be, I would suggest that you set up a Direct Debit to avoid further texts and threats of disconnection. If you're having trouble paying, you need to speak to customer service for payment management assistance.