Discovery does not pay basic claims

On Discovery Classic Smart.

PFD download of Benefits 2019 clearly states "dental check-up at any dentist, dental the****** or oral hygienist", is a benefit.

Now they refuse to pay claim because they do not accept my hygienist's practice type/number.

Number has to start with specified digits (usually indicates type of practice/provider).

What do they not understand the meaning of "any", as quoted from their documents in quote above?

I think the claim is just R 380.

I will take them to the ombudsman, this is an matter of principle.