A man called home while on business trip

An unfamiliar voice answers the phone.
Man: "Who is this?"
Answer comes, "A am the maid."
Man: "What? there was no maid when i left a couple of days ago."
Maid: "I was hired yesterday and started working just today. You are the madam's husband?"
Man: "Yes. Where's my wife? Tell her i need to talk to her."
Maid: "I'm afraid sir, she is in her room with another man."
Man: "What are they doing?"
Maid: "By the sounds of it they are making love."
Man: "It hasn't even been a whole week that i left and she has already started bringing home her lovers? Listen, kill them both and i'll give you $20000."
Maid: "But sir, i might get in trouble for this."
Man: "Don't worry. I have high influence in the police department. i will not let you go to jail. Just get the biggest knife from the kitchen and hack them to pieces."
Hearing this, the maid leaves the phone on hold, goes to the kitchen and grabs the biggest knife she can find, then enters the bedroom and kills both of them. She returns to the phones and asks, "I killed them both. Now what?"
Man: "Just hide their body in the basement. I'll deal with it when i return."
Maid: "But we live in an apartment building. There is no basement here."
Man: "Oh! sorry. Wrong number."