O2 Final Bill Incorrect

[jackjacktrying1]

I recently cancelled my O2 contract with £15 left on my phone plan. In the email I recieved about the money left on my phone plan, it said that this money (the £15) would be added to my final bill. I get my final bill yesterday and it's £11. This is so confusing, as this is lower than both my device and data/text plan. Is my final bill correct? I don't understand what has gone wrong here. Thanks!

[Enlli]

This is a customer only Community 

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