The telephone number 0203 369 0314 is being utilised as part of an O2 scam targeting mobile and landline phone numbers in the United Kingdom. Needless to say if you get a call from 0203 369 0314 you should hang up and block the number.
As with so many other scammers they begin the calls suggesting the recipient needs to make a payment. They are after your bank details. Do not give them another moment of your time. Hang up, Block. Any further interaction with the number 0203 369 0314 will put you at risk.