So, I'm assuming that the desired seats have been assigned to other passengers. Otherwise, the agents would have been able to move your party back to the correct seats.

OK, you just need to decide what would be a satisfactory resolution BEFORE you call Customer Care. Making AS aware of the problem is important, but they are likely to be unwilling to move other passengers around. Then again, since they moved your party around, you have a valid argument that they should move others around to accommodate your original seats.

Needless to say, you are going to have to be courteous and patient with the Customer Care agent.