Spice Jet Airlines — staff issuing boarding pass

I had booked a round ticket for my trip Mumbai to kochi I was allowed a baggage allowance of 15+7kgs initially
But for the same ticket back to Mumbai I was allowed only 7 kgs I assured him I had allowed 21 kgs previously this incident took place on[protected] for flight time SJ 6475 Boarding at 5.30 from kochi ### (angamaly ) airport
The, MANAGER was a very fat guy who just annoyed the issue saying he's supposed to listen to the staff and he dont know anything .
I want my ticket fair back
The spicejet staff can learn to be cooperative rather to be amateur I have paid money for baggage but not allowed to travel with the same
THE STAFF WAS A SHORT GUY VERY VERY DARK AND WITH BROAD LIPS