Hello Zafar,
Basically you were brushed off by the customer service department of Emirates. You should write back and let them know. Is there a manual for flying passenger to know who to contact if the on-board flight crew does not pays attention to your request? Is there any guidlien given to customer what to expect of the Emirates cabin crew and if anyone is under performing who to report etc. Its typical brush off. Once should get a discount voucher a Free upgrade for their inconvenience.
Masood