“Seat allocation”

The emergency exit seat was allocated to my daughter, who is twelve years old. After learning that my daughter was assigned the emergency exit on the loud speaker, my mother requested the air hostess (unknown name) to move my daughter's seat. In response, the hostess was rude and abrupt, stating we should have paid extra to sit together. As my daughter is under 16 and unable to help in emergency situations, we wanted her to move for safety reasons. In two instances, the cabin crew didn't acknowledge the request, until my daughter go upset. Have written a customer complaint 3wks ago and still haven’t receive a response on the matter.