First answer, “Do you have a warrant”...if no, then say “Come back with one.”.....if still persisting, say “I Demand a call to my lawyer”......then call your neighbor over to be a witness....
You could have your lawyer’s number in your cell phone and carry cell phone to door. If they give you any trouble, hit your lawyer’s number and start talking to his office. That would stop the cop types at your door (assuming they had no search warrant).
If they did have a search warrant, they come in while you are calling your lawyer anyway so he knows what is happening.