They would not call you to give you that information - they would contact you via Royal Mail!
Whilst HMRC do now contact on some lob via email and text message its not across the board.
Have had several of these, one the day after a letter from the real HMRC telling me I had a debate coming. They do not communicate by phone, email or text, just post.
I was emailed today asked if I would assist in collecting 3 1/2 kilos of gold for some distressed soul. I would be entitled to one third of it. Now where did I put those scales?