Over charged on bill

[Ivory82]

I have a sim only plan where I pay £16 a and today I have been charged £31.99 I have not used any extra data or made extra calls. This is the second time you have over charged me 

[Bambino · Accepted solution]

This is not O2. This is a customer community. You need to speak to customer service.
Call 202 from your mobile or 0800 032 1402 from any phone or numbers in this link: Guide: Coronavirus Community Help and Support 
When it comes to the reason you are calling, stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
Say 'Upgrade', 'Lost/Stolen', or 'Fraud' if the suggestion above doesn't get you through.
Best time to call is 8 am. 

You can also reach O2 via social media:

Facebook (https://o2uk.co/O2CFB), Twitter (https://o2uk.co/O2CTW), or Instagram (https://o2uk.co/O2CIG)

[pgn]

Sending SMS to multiple recipients over the holiday period can inadvertently cause you to be billed for MMS messages, 55p or 65p per MMS, if you have not disabled that 'feature', @Ivory82: Guide: Accidental MMS Sending and How to Avoid it 

All other costs for out of tariff items here:

https://www.o2.co.uk/help/account-and-billing/extra-charges-guide

Take @Bambino's advice and check with O2 directly, in case it is something more nefarious, as in a Charge-to-Mobile service that you may have inadvertently activated.

Good luck!

[TallTrees]

Ah yes that dodgy old  "nefarious" 

@pgn 

[jonsie]

Word of the day