well lots of fun don't you think you should pay ?
sorry was a little annoyed when i read this as my son also came home on friday with broken glasses! after a younger boy took them off him and snapped them in half! my sons glasses take usually 2 weeks to replace and he cannot see without them, for me to buy a pair for a spare it would cost nearly £50 but that is for a spare the good news for you is that children under 16 get their glasses free well most of the time (i always costs me for my daughters because of the frames she picks) but you can get ones that are free so the mother is taking the Fosters by charging you 220 for glasses i would ask to see them and the order form but also make it clear you will not be paying for 2 pairs of glasses buy one get one free isnt for a full pair of glasses i am sure it is just the frames you get free you have to pay for the lenses in the second pair which she will know as they would have told her this when she ordered them! and that is the pricey part of the glasses
there is now way she paid 220 for 1 pair of glasses she gets the lenses free and it is only the frames that are paid for designer frames