It should be on your phone bill, and if you pay by direct debit, it will be on your bank statement.
The answer has already been posted above.
This is a customer to customer forum only, where forum members, who are only BT customers, can help each other with BT Retail products and services.
Anything you post here does not go to BT. Although the forum is moderated by BT, not all posts are read.
As well as what you have already been told you could try Live Chat and they may be able to help
https://bt.custhelp.com/app/contact/c/2902/?s_intcid=con_intban_sanda_contact_us_chat_from_forums