I am complaining because of unfair practices by mercy health of pittsburg ks

I am complaining because of unfair practices by mercy health of pittsburg ks. I was referred to mercy for an irradic heart beat. And have been through 4 tests that have produced nothing but normal results except the irrdaic heart beat. But was told i wouldn't be treated unless I did a heart cath which is 10xs more ecspensesive than the rest but because my insurance would allow it they wouldn't treat me unless it was done