The same thing happened December 3: 16.30 in respect of Canada and United States and the last two mobile numbers.
I managed to speak with the chat line and got nowhere; then I phoned VM 150: it took ages to sort out. In the end they reluctantly reimbursed me £3 or so. But told me that this was a one-off and would not be repeated. I have noticed that several people have complained about receiving picture message costs. EE admitted a glitch and refunded.
The two mobile numbers belong to colleagues but I did not send them picture messages. One received short messages about meeting up; the other received longer text messages (and I gather that any message over 160 characters is automatically charged as a picture message after conversion. The assistant showed me how to prevent picture messages being sent from my phone, including an alert if such a picture should arise.
Let's hope that things improve in the future. I have said that if this sort of charge crops up again I will consider leaving VM Mobile, reluctantly, because the other services are very good (broadband/TV).
Do you think there has been a glitch in the system?