I agree with posts that say they are trying it on. Your landlord's chain of contact with you is either personally or through his agents, not through neighbours. Keep calm and carry on! (It might be an idea to wipe off any marks you make if you can)
If unsure get advice from a solicitor (Look for the sign that shows two people sitting opposite each other, that means they will give you initial advice free). Or try C. A B., also free.
If unsure get advice from a solicitor (Look for the sign that shows two people sitting opposite each other, that means they will give you initial advice free). Or try C. A B., also free.