Ending a contract

[Mina97]

Hi. I just phoned O2 on 202 for the second time. I phoned them the first time 3 weeks ago to end a contract for a sim card and get the 2nd phone number removed from my o2 account and I was told that in 2 weeks I should get my final bill. It’s been 3 weeks since and nothing happened and today I phoned them again and the person that I spoke to assured me that it’s all done now but on my o2 account the phone number is still there and it still saying that I’m gonna be charged again on the 25th of June my usual tarrif. Like what am I supposed to do? I don’t use that sim card and I don’t want to be paying for it anymore.  Both times I didn’t even get an email to confirm that the  contract will be terminated. 
thank you

[MI5 · Accepted solution]

@Mina97 

Guide here Guide: Cancelling Your Contract 

[Mina97]

I’ve read the guide but I still don’t understand what I’m meant to be doing. I’m not cancelling the contract with o2 because I’m going to a different provider. I want to cancel a number  because I don’t need it at all and I already have another number with o2 that I’ll be keeping. Both numbers are on the same o2 account

[MI5]

@Mina97 

From the guide:

I want to terminate my contract but am not signing up to a new mobile network

Two options here. You can follow the original guide linked above (https://community.o2.co.uk/t5/Pay-Monthly-and-Pay-Go/Cancelling-Your-Contract-A-Guide/m-p/566774/hig...) or you can get a PAYG sim for any network that is different to the one you are leaving and give them a STAC code to close down your old account