Air India Express — Laugage

Hi I am Tamilarasan S/o Govindaraj travelling on 14th may 2015 in airindia express from trichirapali to singapore, my hand luggage was 7.8kg and my laptop weight of around 4.5kg, your customer service officer said they don't allowed hand carry with laptop only 10kg, she ask me to withdraw ur hand carry weight to 10kg weight with laptop if not can't allow, am asking laptop weight is 4kg even my hand laggage I'd 7 +4 =11 kg so how, she said u speak rules so I won't allowed now I left my laptop in india, am suffering without my data in singapore, is this ur way of treating a passenger really annoying ..if you need more details please contact me at +[protected]/82864389