GoAir — baggage charges and refund of remaining amount

Hi go air
I am delighted to travel in go air and i am booking frequently only with go air. Today at hyderabad airport my baggage exceeded 3 kg extra and i paid 1500. Total amount charged was 1200. Remaining charge was not given as i was in hurry for boarding. Request you to to plz check and provide me the same. I didn’t expect this from go air team. Plz provide me with go cash as a refund amount.