Lost the tracking number

Hi everyone,

I sent a package three weeks ago by train because I was moving to another city. They said it would take two weeks to arrive but I haven't received anything. The address was correct, my phone number was on the package and yet, nothing.
I tried to know what was going on, so I contacted China post and unfortunately I lost the tracking number. Thus they keep on telling me that there's nothing they can do without this number. But there must be a way to find my package. So is there someone who could tell me what to do? do you have any solution, please?