Bought a new house, still getting tax credit

Hi,

I bought a house last week but I am still getting tax credit. I did talked to hmrc some ago about stopping tax credit, but I am still getting it.

But, today when I am moved into my home, I got a call from hmrc about my address confirmation.
Is this a normal procedure that they call after some time for address confirmation Or are starting some kind of investigation?

Farhan