I missed my flight due to overweight luggage, the officer in-charge asked me to takeoff...

I missed my flight due to overweight luggage, the officer in-charge asked me to takeoff some weight without the possibility to pay extra charges , while i was unpacking my luggage the officer informed me that there is no time left and they will close the gates by that time i was done and ready but still he refused to let me enter the gate , I tried to submit a complaint but I couldn’t, i would like to Know the possibility and charges of changing my flight and if there’s any contact number to communicate with in uae below is my ticket number for your reference:***************MFTCNT *Ticket holder : Khalid Abdul Hadi **Thank please note that I’ve tried to call etihad airways and they informed me that i have to contact with you as the flight is only operated by them. **Please help me to solve this matter as i don’t have much time.