Hi Maria17,
Thanks for posting on the Community Forums! I'm sorry to hear that you have been charged after cancelling your mobile contract with us.
Can I check that you also cancelled the direct debit for this SIM? If the SIM has definitely been deactivated and any handsets have been returned, the only thing which would cause a payment to be taken is because the direct debit has been set.
What date did you order the services from us and what date did you cancel please?
Thanks
Beth
Beth