That’s when you reply to the company and tell them that you find their policies rather predatory and not too dissimilar from low-class “payday loan” companies and that you want them to remove you from their mailing list and you will from now on mark any emails from them as spam, and sent straight to the trash.

CC it to the landlord as well.

He has the right to use their services, but you have the right not to do business with them. Your agreement is with the landlord NOT a third party that came in after the fact.