Fraudulent call?

[Iggy1978]

I have been contacted by 0330 053 2334 stating they will be giving me up to 40% discount on my bill, can you confirm if this is o2 or a fraudulent scam? 
they sent me a one time code but I was not comfortable with the conversation and ended the call, I have not given them any personal details and I did not read the code back to them.
Below are the messages

*SECURITY WARNING* The one-time code you requested will arrive shortly. If someone's calling you and asking for a code, please end the call because they DO NOT work for O2. If you suspect fraud, call us on 202 so we can protect your account.

*Be alert to fraud* NEVER share this code, including with O2 staff. Help us protect your O2 account. To retrieve your My O2 account, enter code 693448.

Regards

Ian.

[Cleoriff · Accepted solution]

@Iggy1978 

It's a well known scam.

O2 are not offering 40% off.

You need to report it to the police and O2.

Ways to report here including Action Fraud website

https://www.o2.co.uk/help/safety-and-security/phishing-and-smishing-advice

Block the number and do NOT follow any links or OTP's and report it free to 7726

O2 advice here   https://www.o2.co.uk/help/safety-and-security/phishing-and-smishing

https://www.actionfraud.police.uk/

How to block a number:

https://www.samsung.com/us/support/answer/ANS00062352/

https://support.apple.com/en-us/HT201229

[Cleoriff]

@Iggy1978 

Just to add. https://who-called.co.uk/Number/03300532334 

[erictharg]

Ditto. Like you, I was wary and ended the call.