F2被拒因為大使館電腦裏F1的資料有錯

you have to use your old passport, visa pages, border stamps and trave records to argue your case.
specially looking the F1 visa page from china.
also looking B1/b2 exit record (like enter china stamp)

write down:
B1/b2 visa date. trave date, exit date
china F1 visa date, Consulate, trave date,