Can we please set the record straight. There is absolutely no valid reason for anyone to call the airline (either the ticketing or operating airlines) or their OTA. There will never be a valid reason, certainly not until you have flown the first sector.
If you want to cancel - you shouldn’t have booked
If you want to select seats - you’re in business class, all the seats are good!
If you want to change dates - it will reprice anyway, fly the first sector first.
If your credit card wasn’t charged - be patient, it will either happen or it won’t, calling just makes you a selfish ....
While I’m at it just a reminder that your ticket isn’t 100% safe until you are on the plane. Don’t book any non refundable plans you aren’t prepared to lose until you’re on the plane. Even though this was clearly just a great deal/flash fare sale some airlines love to play stupid games.