Spice Jet Airlines — Grieviance against their unrealistic and mone minded policies

I have a desktop screen. I want to carry it as my only hand luggage. I called customer care and they are telling that I cannot do it. My question is why I cannot take it as my hand luggage ?

It does not cross limits of 55×35×25 cm, does not cross 7 kg, it does not contain anything that is not allowed. In fact, you allow laptop on flight cabins. So why can I not carry it as hand luggage ?

They also told me something about special package which will cost me ₹1000/-. My question is, why should I pay for something that I already eligible to do myself.