Booking a child

Hi all
Some advice needed if possible please, just booked myself and my grandson on LHR-JFK return for June 2017. I had to call the flying club as you can't book flights for children on their website at the moment. They charged me the full cost including taxes for my grandson, who 10 years old and said they can't work the tax cost out at the moment, the person on the phone did give a reason but I can't remember what it was. They told me once it's all paid for I would be reimbursed the tax for my grandson, I asked how much this was but they couldn't tell me, do any of the experts on here happen to know how much I should be getting back???
This all seems very strange to me! How on earth I'm supposed to know how much I should be getting back is beyond me. Is this typical of virgin? Anyway, if someone could let me know roughly how much I should be getting back once the tax is returned I'll be able to keep an eye on this and work out if it's correct.
Thanks in advance for any help and hopefully you understand what I'm trying to say, I'm getting confused just thinking about it!!!
Thanks
Trevor
Some advice needed if possible please, just booked myself and my grandson on LHR-JFK return for June 2017. I had to call the flying club as you can't book flights for children on their website at the moment. They charged me the full cost including taxes for my grandson, who 10 years old and said they can't work the tax cost out at the moment, the person on the phone did give a reason but I can't remember what it was. They told me once it's all paid for I would be reimbursed the tax for my grandson, I asked how much this was but they couldn't tell me, do any of the experts on here happen to know how much I should be getting back???
This all seems very strange to me! How on earth I'm supposed to know how much I should be getting back is beyond me. Is this typical of virgin? Anyway, if someone could let me know roughly how much I should be getting back once the tax is returned I'll be able to keep an eye on this and work out if it's correct.
Thanks in advance for any help and hopefully you understand what I'm trying to say, I'm getting confused just thinking about it!!!
Thanks
Trevor