The spokeswoman said the way the concert was set out meant the front of the stage was not an appropriate place for wheelchair seating. With general admission ticketing, seating was usually available at the back of the venue.
Wassong was offered seating at the back, as well as down the side by the bar, slightly elevated, or on an upper level with a restricted view. However she was "pretty adamant" she wanted to sit at the front.
Wassong told the Dominion Post she was taken to the upper level but it was impossible to see.
The fact the concert had already started made it difficult to negotiate a place for Wassong.
"We're very sorry to hear that it was a bad experience," the spokeswoman said.
"She was given three different options that were suitable for a wheelchair in terms of a clear entry and exit point in the instance of any incidents, but she really just wanted to sit right in the front of the stage."
Wassong has been contacted for comment.