COVID INSURANCE CLAIM RT PCR issue

Hi All,

My father covid claim rejected by insurance company since RT PCR not available.

Rapid test : Covid Positive
CT scan : 75 ℅ lungs infected
Hospital Admitted : Govt approved Hospital.

Discharge summer : covid +

Authorised letter from hospital which says not need of RT PCR.

Can any one suggest Is there any way to approach legally.

Thank you in advance

vinod