I have been dealing with O2 since November of 2023, it is now the 20th of March 2024, O2 overbilled us in November for over £4000, only in January 2024 did they rectify their billing error, no one apologised or anything, come February, they shut off our services for no reason at all, we made our payment, have proof of payment on our O2 account, and they stated they can't find it, called back on the 26th of February because they sent us a threatening letter, the issue was not resolved, they stated that the finance team allocated our payment to someone else's account!!! We also made another payment on the 26th of February for the March month, however they did not allocate our payment to our account. I phoned again today to talk with a manager about the issue; John answered and said he'd want to go through the security check with me; the line became silent; I said "Hello"; no answer; I waited 8 minutes on the phone before he cut off the line. Their services are simply horrible, and O2 customer service is diabolical; they do not care about their customers, refuse to take accountability, and fail to address complaints.