O2

I've just received a text message from a mobile number claiming to be o2 saying a payment could not be processed by my bank. Seems strange as my bill as already left my account. Where do i report it or confirm it is a legit message?

I've upgraded my contract from a pay monthy to a 18 month sim only deal, as ive paid off my device plan in full. Does that mean the old contract is gone ? What happens to the seperate airtime bill? Does that continue to be paid or will it just be £15...

I've tried to contact o2 payment management team to make extra payment to device plan, i go through checks and it tells me staff levels are low which is understandable and wait times are up to 15 mins. Then it says we will transfer you to one of our ...