Hello, Nicky!
Wow! You're faced with a difficult situation, but I know you will sort it out sooner or later. If I were you, I'd have already taken them out of my house, but what else can you do? It's high time you started thinking about the consequences of your actions, so let me give you some recommendations.
Anyway, theThe first thing you should do is have a conversation with your friends, which means explaining to them that they can'tcan no longer stay at your house unless they pay their expenses and take turns cleaning your flat. Otherwise, they will have to opt for a hotel.
The best of luck, and let's keep in touch.