ANSWER:
I don’t know! You can sit and weep for the rest of your life over this and nothing will change and the money won’t come back and everyone involved are living their lives and enjoying it while you are depressed and sad!
Or you can be grateful that the marriage didn’t take place and Allah has saved you from having children with her and after few years, you ended up divorcing her while she gets the children and your money and bring them up in an unislmic fashion.
I don’t know about your agreement but in Islam, a woman and her family are not obliged to pay a dime for the wedding! Why would you take anything from them, let alone cancel the marriage because of that?