I contacted the supplier of the goods I purchased and was informed that it was delivered. I haven't received my merchandise yet. Trace code is AS751547276

Hello! I see that my package EJ380169482ES is being stopped with the reason of
1) Is it correct that "Merchandise invoice is missing to complete the process"?
2) What is that?
3) To which address do I send such an Merchandise invoice?

My package is not a merchandise, it is birthday present. The probelm is, that some of the things I made myself, and I don´t have an invoice, as i MADE those things myself.
Many thanks for your help!!

I'm waiting for some merchandise, I paid for the shipping and you are taking too long, absurdly bad, this service of yours. This is the tracking code: UT484767577CN. Where is this merchandise? Update your system.