Is it true that if your employer's extended health benefits provider sees you're not using your benefits,that they can reduce coverage?

I've heard from someone that if you have benefits from work (dental, physio, etc) and that if the privder sees you're not utilizing them much, that they can reduce coverage.

For example: you have $1000/year for massage. But you only use $100 of it, the benefits provider will see that and reduce your coverage to $500/year.

Has anyone heard about this happening?