Charge to NULL

[Billing123]

I've been charged £21.99 to NULL on my bill but havent bought anything,  does anyone know what this is ?

[jonsie]

This looks like something you’d need to call O2’s customer service team about – give them a call on 202  or 0344 809 0202

Use the specific Payment management number  0800 902 0217

The opening times are:
Monday to Friday – 8am to 8pm
Saturday – 8am to 6pm
Sunday – 9am to 6pm

[Bambino]

@Billing123 See these guides:

Have you fallen for or been conned into a premium ... - O2 Community

Phishing, Smishing & Scams. Latest info & advice. - O2 Community

Tips to avoid unexpected charges on your bill - O2 Community