keep calling I don't answer. They leave no message

Same here. WhO is it?

This is AHS home warranty trying to see you a heating/cooling Preventative Maintenance Package.
The guy that called me was extremely rude.

Caller ID had it come up as "Option One Mortgage" and I didn't answer.  No message, they have called several times so far.

I think you took their word for it that they were AHS.  Guy next to me in the office received the same call with same rude guy.  I believe it is a scam and is not AHS.  Number also verified to be Option One Mortgage.  Guy got very confrontational when told by co-worker that he didn't believe it was AHS and believed it to be a scam.