As far as the Etihad call center, that is up to them how they wish to proceed. 2 Low cost carriers in the United States discontinued their toll free 1800 numbers, and now you have to dial 1 the area code and the number as a regular toll call.
as far as seating goes:
https://www.etihad.com/en-us/optional-service-fees/
On an Economy Deal, Saver or Classic fare, reserve your seat in advance, for a small fee.
Rates: USD 10 to USD 30 (varies by route)
Upgrade to greater comfort for a small additional charge.
Rates: USD 30 to USD 180 (varies by route and flight)
Sometimes, we all need a bit of peace and quiet. With Economy Neighbour-Free, you can enjoy up to triple the space and comfort by bidding for one, two or three neighbouring seats, which will stay passenger-free for the duration of your journey.
Simply ‘place your bid’ in the box below and wait to hear from us. Good luck!