Only giving them 1 star cause i cant give them none.Terrible company and ive been a customer for over 13 years.Phoned up to pay off my device early and to see what my options were to lower my monthly costs only to go through the upgrade process and find out it was the wrong handset they had set up.Phoned back to cancel and set up a upgrade deal for the handset i wanted only to be told i need to wait 24hrs for the wrong handset to come back as returned.Phoned back the next day to be told it was still not marked as returned and again to phone back in 24hrs.Phoned back again to be told it wasnt marked as returned as first told and a notice of complaint had been issued and someone from the complaints department would phone me within 7 days.8 days past still nothing so phoned them back to be told once again the wrong handset was still not “returned” went through it all again and was again told complaints department would phone back but this time within 5 days.7 days then passed and still no phone call so finally phoned to cancel only to be put through to the complaints department (before i was told there was no direct line or couldnt be put through to complaints department) so spoke with someone with complaints in the morning and was assured to be phoned back in the afternoon 3 days passed and still no call back so phoned to proceed with the cancellation and move to another network.Will be glad to see the back of o2 after all this terrible way to treat customers