!comment_text!
Caller: !caller!
dont know this number
Claim to be O2, but no serious professional organisation harasses its customers on a daily basis and refuses to take NO for an answer - that would be corporate suicide. SO, I conclude this is a bunch of scammers after your bank details.
Criminals who have stolen customer details from O2. Do not answer. Report to police.
Possibly o2 (strong accent) trying to sell contracts.