Assuming they weren't premium rate numbers and you haven't exceeded your call allowances you shouldn't have been charged.
Check they were standard mobile or landline numbers and then give customer service a call.
http://www.o2.co.uk/contactus
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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