I have been charged for 7 calls recently - apparently made from my land-line that I definitely never dialled.
I called 150 and had a discussion about why I have chargeable calls on my home phone, but didn't really get anywhere. It was 'yes you did', 'no I didn't' ' yes you did' etc
I never use my land line phone and definitely did not make the calls. It looks obvious to me seeing the itemised statement that something is wrong, the numbers have mostly 1's and 2's in them. I had a lunchtime call back from a distressed elderly lady who wanted to know why I had called her at 4 in the morning.