Name and shame the property.
Any Marriott brand should have clean sheets and towels, and clean hallways. They should reply to the app promptly and they should try to upgrade Platinums.
They also should make the bed. If I've ever had either a HK person hand me sheets without actually changing them (a Westin once) or a bed with dirty sheets upon pulling them back (a Courtyard once) my points for either stay were refunded as an apology.
I would expect the same here. You paid 35K per night and didn't even do the 5th night free? Wowsa