We heard a noise under our lounge floor in fri and saw suspicious dropping in kitchen on thurs, last 2 nights been very squeaky and scratchy, put poison blocks down, concreted holes in to kitchen through wall, think found entry point into lounge by air vent, have concreted all along front of house, it went mad!! Have it sealed in but dont know how long it can last???? help am ill with it am sooo petrified.