From my understanding both restaurant managers and cooks are not in their list of priorities. My agent told me he had clients in my same situation waiting longer than me.
As I said a friend advised me to call, as she also waited for long on her visa, and after she rang she got it approved within the week. I rang directly the number at the bottom of the acknowledgement letter and surprisingly my phone call was picked up straight away. I was already expecting to be on hold for a while.
I'll keep you guys updated