Outstanding bill

[Tappet]

Hiya, I received a bill from O2 after I left for a final payment of £18.04.

I was asked to login in to my O2 and pay by following a link, I did this but had no payment option in My O2 anymore. I rang O2 to sort payment and was told I can not pay the outstanding because I don’t owe any money and my account shows no money owing and balance is zero. I was told the bill was in error and I was to ignore it, now 3 weeks later I have receive an email saying my debt of £18.04 is now overdue and has been passed on to the bailiffs, ivevrung O2 again today 1st April 5 times and been on hold and cut off everytime, I also send an email to O2 9 days ago asking for confirmation that I owe nothing and received an email back saying they will get back to me within 7 days, but like I say that was now 9 days ago. 
can anyone advise me on what to do or give me a number where I can get help to resolve this.

many thx in advance.

[MI5 · Accepted solution]

@Tappet 

You need to contact payment management
To pay bills, ask for payment extensions etc, you need to contact the Payment Management Team.
You can reach the Payment Management team on 0800 902 0217.
The opening times are:
Monday to Friday – 8am to 8pm
Saturday – 8am to 6pm
Sunday – 9am to 6pm
https://www.o2.co.uk/help/account-and-billing/payment-support
Best time to call is around 8.00am