Name server changed without my Consent- help me

Someday ago I got one mail from Hosting Service provide stating that
"We have received a request that the name servers be changed for the following domain name(s)
:www. mydomain. com (original domain name changed)”
I did not request anything from them; I can open my hosting account and can make necessary changes. My domain is 3 months old.
Is someone trying to still my domain or anything else? What should I do? Can anyone explain me what is going on?

They might be trying to sell you some hosting. Ignore it. Your site seems to be up & running.

Hello,

You're going to need to contact your domain registrar about this.

Jack

I have never had this happen to me with any of my domains it might be someone who you gave your info to did you ever give the info out? And also did you leave it the same or did you change it if you did?