room rent deducted for hospitalization

i have niva bupa policy which had no room rent capping during vocal cord cyst ot i had decided to stay in suite room as there is no room rent capping and no room type limitation and stay was 2days now during cashless authorization they deducted rs 9000 by saying that as per eligibility of room of my policy now when i raised the issue they asked me send all the original bills of hospital and they will reimburse the but after sending they again rejected and they are now told me that they think that i should not go for suite room instead go for single private room but in policy t&c there is no room rent capping and no room category limitation or nowhere mention that niva bupa will decide the room

now what to do & how to go to court? This pure illegal