Still unsure exactly
Ok. Then I don't think it's at the consulate; it's still sitting at NVC.
However, since you aren't sure where the case is, I will advice you contact both NVC and the consulate and state that you are withdrawing your I-864.
And additionally, probably not necessary but also contact USCIS after successfully withdrawing the I864 to withdraw the I130 since you also signed that form.