Flying tomorrow with my girlfriend to Vancouver from Dublin. First leg is Dublin to Halifax, next leg is Halifax - Toronto and then onwards to Vancouver. I purchased two economy tickets months ago, but under two separate bookings. Flight departs tomorrow at 9am Irish time (GMT), so I was ready to select seats and check in at 8.30am. When I logged in to both bookings I saw that I could select seats, so I chose two beside eachother on all 3 flights. There was no fee showing to do this and I got the following message after selecting seats and confirming.

Success
Your new seat selection has been successfully updated and your reservation is confirmed. Changes complete. We've sent a copy of your itinerary to:

Your payment has been processed
Price details
Price summary
Difference 0.00 EUR

I was delighted. I then came back at 9am to complete both of our check ins, only to be met with the following message

"Check-in not completed
We could not complete your check-in at this time because there are fees owing on your booking. Please proceed to the airport and see an agent at check-in assistance"

I have been on hold for the last 90 minutes to Westjet trying to clear all this up. There is no way I should owe any fees... I tried to request a callback online, but it won't accept my Irish number. I've also tagged them in a tweet requesting that someone gets in touch with me ASAP.

Please help!