My main gripe wouldn't be the cost of the call, although that's highly valid, it's the lack of a joined-up process when the outsourced agency are involved and the "call again but select another option. Oh, but only after a certain time" approach.
The club are completely free to structure this...
£38.50 for the United game WSU U-18 -> Adult. I know as I've just spent 20 minutes trying to figure out what the Albion charge on my credit card for the day I went on holiday was. You must be in the cheap bit of the WSU.