Udemy API / Masterstudy Theme

I bought this theme(masterstudy), and Udemy sent me an API which is not working at all, my udemy affiliate theme prices(masterstudy) are not the same as Udemy’s official site! both parties (stylemix and udemy) are defending themselves and don’t want to correct this issue. Udemy is telling me that API issue is no more valid although they sent it to me!!! and stylemix is saying this is not their problem and they won’t refund money as the issue is not from their side.I am trapped now between both, and can’t get my money back, and finally stylemix told me to contact theme author…I really don’t know how get out from this dilemma!!!