Air India — harassing behaviour by airport staff

I had a flight on 25/6 after my travel from DC . I had couple of extra luggage however I made a point too reach early to avoid any problems . I also upgraded my economy class tickets to business class thinking that the baggage allowed will increase. After some discussion the people at airport concluded that upgrading doesn’t upgrades baggage allowances so u need to pay extra. I was ready to do that I asked then I willl my extra baggage amount but then refund / cancel the upgradation as it is of no benefit to upgrade but at last I was with the words pay fast for ur extra luggage, we cannot refund for upgrading n do it fast else u would miss the flight, n loose all money u spent which is not accepted. I just accept a decent behaviour with passenger n just not waste their time n end forcing to pay quickly ( harassing mentally), I don’t want any refunds but They owe an apology atleast n make sure they don’t do this again. I was also astonished to know this is usual behaviour with every passenger who travel after a long journey with extra baggage