Serving Notice To Quit

[Martha T.]

Hi All, hoping to get some advice. We're new landlords and this is a unique situation for us. We have a tenant that had an authorized occupant to which we gave Notice to Quit just a couple of weeks ago. He remedied it immediately and then paid rent for September. He has the same unauthorized occupant back! We had a clause if the same situation occurred within 6 months that he would get an eviction notice. Question is - do we give him the remainder of the rent back when he leaves?