Mediassist — repudiation of my claim

I recently underwent d&c procedure at a clinic because of a missed abortion. I submitted relevant bills and report but my claim has been repudiated on the grounds that i was treated as out patient.
I was treated by my gynaecologist and procedures were carried out in a way she thought it would be correct.
Hence i was treated without being admitted or hospitalised as she thought it was not required.
But i underwent dilatation and curretage which is very well covered under mediclaim policy.
I want to lodge a complaint for the same.