Landlord Won’t Stop Entering Unit

Hi, MA renter here. I rent the basement of my landlord’s house from him (split top ranch style) and he lives above me. He repeatedly enters my unit without my permission and messes with my thermostat, turns lights off, locks doors, and does other things that are against the law. Important note: I pay well above market rate for rent, and as such utilities are included. I’ve given him multiple chances to stop this behavior, but today he came down and adjusted my thermostat again without permission, and I’ve decided it’s time to take further legal action.

I understand that in MA I can submit a formal complaint via Form 15, but I was wondering if anyone could give me guidance on what I should ask for to prevent my landlord from going into the unit again.

One important thing to note is that I didn’t realize before I moved in that the laundry machines (in my area of the house) are shared, so I’ve given my landlord permission to come down into the unit ONLY to do laundry- there’s nothing in my lease outlining that the laundry is to be shared, but I’m letting him access it as a courtesy (from what I understand I could deny him access since it’s not in the lease nor was it communicated to me).

One thing is for sure, after this experience I will never live in the same building as my landlord again, but I just want him to stop invading my privacy, what’s my best recourse?