The landlord's problem should be the quality of latex mattress, which will collapse after sleeping. In this case, I can tell you that there is no way to undo it.
The biggest advantage of natural latex mattress is that it does not deform, not to say that it does not deform at all. It's still slightly deformed after a long time, but it's much better than coconut palm mattress, spring mattress and memory cotton mattress.
The new latex mattress, no matter how high-grade, needs to go through a health care process after being bought back. Generally 1 to 3 months later, they need to make diagonal replacement or reverse adjustment, just like running-in when a new car is bought back. After running in, the service life will be greatly extended.
So what can be done? Some can only make up a layer of natural latex cotton as soft and hard as the original. In this case, the comfort will be improved, which is basically close to the original experience.