Karnavati Bikes — Not giving discount return

Address:

Ahmedabad, Gujarat

I purchased hero splendor + on 30th march 2017 from karnavati bikes bapunagar, ahmedabad. I made payment of rs. 55000/- but company still not giving my 7000/- rs. Back as discount offer... On 30, 31st march 2017. And bike delivered to me with big dent on petrol tank.. And tank is also not replaced by the authorities till today.. I want my discount money otherwise i would like to return bike as it is..
Kindly see in.