Wrong billing amount

[Dav135]

Hi. I recently changed my phone tariff to sim only, £12 per month for, 12 Gb data, and unlimited calls and texts. I have just received my bill and it is just over £15. This must be a mistake so can someone please get in touch with me to resolve this issue. 
thank you. 
regards. David. 

[jonsie]

Possibly an almagamation of the old and new tariffs up to your billing dat6e

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