Lost package

Hello, I received an package with an item that's not as described and I ask to return the item. The seller give me a return ticket and I give the package to GLS Parcel Shop at Vilvoorde. There I received a receipt when I let the package.The problem is that GLS lost my package and they don't wanna refund and the seller (AliExpress) can't refund me because on the track and trace of the package says that the package is in transit (but isn't moving from 5weeks already) So nobody wanna refund and the package is lost somewhere in the GLS warehouse

Dear Mr BarbaOur apologies for the inconvenience.Could you please tell me what the content in your parcel was so that I can request an urgent and complete search of our depot in Vilvoorde.SincerelyChristine

Hello, It was an projector (small size) . Thanks you

Dear Mr BarbaUnless I am mistaken, I have not yet received any feedback on my request for information of 21/06.Thank you in advanceKind regardsChristine