If you have been charged for these numbers as though you dialled them, and they are on your itemised bill, then get in touch with your service provider
( whoever you pay your line rental to ) and ask them to confirm the number.
I must add,( but it is rare,) that BT staff when working in a joint or a cab, can cut down a pair of wires and clip their phone onto it and use it, and this does still sometimes happen, so then people get strange numbers on their telephone bill.