>>I had difficulty in getting her to take no for an answer.
Why were you even talking to her ???
A total stranger phones you up out the blue, CLAIMS they are from Sky
(you have no proof), and you waste you time talking to them.
If I get an unsolicited call or someone trying to sell me something I put the phone down on them.
I suggest you do the same or you run the risk of getting scammed.
DONT believe ANYONE who phones you up and says they work for company x y or z, hang up on them.
If it is important, or from a genuine company, they will write to you.