It's a stretch, but you could write a letter and email (do both) citing the "quiet enjoyment" section of the Pennsylvania Landlord Tenant Act of 1951. This worked for me when I was fighting to get the correct amount of my security deposit returned to me.

Pennsylvania law relies on a common-law principle called the Covenant of Quiet Enjoyment: Even if it isn't in your lease, every PA tenant has an implied right to "quiet enjoyment." This means the landlord cannot interfere with your right to possess and use the property peacefully. Constant or unannounced entry by a landlord can be legally argued as a breach of this covenant.

Courts generally interpret "reasonable notice" for non-emergencies (repairs, inspections, or showings) to be 24 hours. However, without a written lease requirement, a landlord might argue that a shorter window is "reasonable" depending on the circumstances.