Congratulations, you have snakes in your house. I hope it's nonvenomous. Rats don't just leave where they're seeing food. They multiply, they don't reduce. For you not to see them again, there's a snake (at least) coiled up somewhere in your house.
Do proper deep cleaning to find out where the snake is.
@Just_Torpeh@seyikanbai Uni in the Uk dont make tests random like Naija, its easier to make yourself available when you know your test date like a month before