AliExpress complaint: delivery was not received but money given to the vendor – Order ID: 8142061126626909

I ordered two chairs via AliExpress. The vendor gave me a tracking number which was incorrect I have contacted the local delivery company here (Correos in Spain) to check. Apparently the number I was given was linked to someone else. I am not saying that the vendor did not send the product but he was not responsive and just stated that according to the tracking the product was delivered. AliExpress wanted from me a proof that I have not received the products which I cannot provide (How?). I have asked Correos to provide me with evidence that the tracking number was linked to another person but here in Spain this is illegal as I am not linked to that number!!!
Also, the vendor has only shown that the the number was received but not shown by whom – not signature or NIE (which generally is requested here in Spain).
I have asked the vendor to contact China Post to request the correct number but the vendor (as during the whole process) has not responded and has been of no help. While I have explained this to AliExpress the did not seem to care. This means that there is a huge flaw in the system and one should not EVER buy from them. If the delivery company makes a mistake and one does not receive the product ordered one has no change of proving this. And if the vendor has no interest in helping one will have simply paid for a product and has no chance of receiving it. One email or phone call to Correos would have supported my case but as one cannot get in contact with anyone at AliExpress