Don't open the door but be calm. You have rights.
Ask what they are there for. Ask for an interpreter if you need one.
If they ask to enter, ask if they have a warrant signed by a judge. If they do, ask them to show it to you through a window or slipped under the door.
If they do NOT have a warrant signed by a judge, you may refuse to let them in. Ask them to leave any information at your door.
If they force their way in, don't resist. Tell everyone in the residence to remain silent.
If you are arrested, remain silent and do not sign anything until you speak to a lawyer.