Parcel Stuck In Customs

I am more than frustrated with Fedex delays and no updates. I know some of this delays might be due to customs but my issue with Fedex is lack of communication. I received a notification that my parcel is delayed in customs and I was requested to submit documents to prove the value of my parcel. I immediately responded with the required documents. It has been 7 days now my parcel is still not moving and my emails are not responded to. I have sent numerous follow up emails to Fedex with no response, a closest thing to a response I received was one of the Fedex employee requesting the other to provide me feedback but still nothing came through. I am not even sure if there is anyone working on my parcel release since Fedex can't even respond to emails. Can someone please let me know what is the issue with my delivery and what Fedex is doing to get my parcel delivered. I also just received another delay notification for my second parcel, I really don't what is going on.