Did you call the customer support?

It would cost more than the invoice to do so

I have a very similar problem. I live in the US and I terminated my contract but my December invoice shows over 100 euro charge. I didn’t use the phone service and it’d be super expensive to call the customer service. 
 

Hello @DarbFlarb and @dspma,

unfortunately, I can't look it up for you right now. I would need more information for that.
If it's OK with you, I'll activate our private messages so that you can send us the relevant data and we can take a look. Just let us know here!

Kind regards,
Jessica

That works for me thanks

Please private message me. Thanks

Hello @DarbFlarb,

I have sent you a private message and will take care of your issue after the Xmas holidays.

Best regards

Giulia

Hello, I have the same issue. I deactivated my account at the end of August and I still get 7,80 Euro invoices.

Can you please contact me?

Hello @ahmetsaid,

welcome to our o2 community

I have sent you a private message in order to check your issue.

Best regards

Giulia