回复：我的PERM certified 1个多月了，还没拿到正式文件

Fire them. But for me, it is me who told the laywer how to do. There is a standard procedure to follow. The offical time period to receive the written approval is 15 business days after your PERM is certified. Beyond that, you can file I140 without the certificate. Push your laywer to get answer from DOL.