Having to take them to ofcom and the communications ombudsman for complete failed service and missold connect. You would not believe the level of incompetence from start to finish. Sold unlimited data and then when there was a limit set they repeatedly broke promises of during it due months. Customer complaints have not returned communication despite promises and their own automated messages saying I would get a response with 7 days. The service itself has been failing for months with an ongoing issue. Finally after they agreed to cancel the contract with no termination fee they are now trying to charge this stating that there is nothing on my account stating this. Have involved ofcom and the communications ombudsman. O2 have failed to provide the information requested for them. Will also get further legal advice. I've spent over 15 hours trying to sort this. I've tried telephone calls, emails, messages through their app, web site and messenger. Each step was a complete failure. Look at reviews at other review sites. O2 are shocking, in fact embarrassing.