O2 fined £10.5m for overcharging customers O2 balloon

Ofcom has fined O2 £10.5 million for overcharging customers over an eight-year period due to an issue with its billing system.

An investigation by the regulator discovered that some customers leaving the operator were charged twice for items on their final bill. O2 initially identified errors with its processes back in 2011 but the problems continued until 2019.