Paquete marcado como entregado, pero nunca lo recibí y UniUni admitió la pérdida

This is my situation, the seller told me to open a dispute that Ali telling me this.

Dear customer

We are really sorry for the inconvenience caused to you due to logistics issues. If you have not received it yet, we suggest you upload the proof and initiate a dispute for lost goods. Select "Goods in transit" and "Haven't received the package yet." AliExpress will give you a fair judgment. Thank you for your understanding.

I made a purchase from the POCO Official Store in the name of my wife "RosaMiry De los Santos Saba" on AliExpress with shipping through UniUni. The tracking number UUS52C0947918773433 says the package was delivered, but I never received it. I contacted UniUni, and they admitted that the POD was invalid and that the package was lost, which was confirmed by an email they sent me, but the seller has not taken responsibility or offered a solution.

UniUni posted a photo of a package that is not mine, with a different tracking number, and also an undated delivery receipt, which is completely unacceptable. Despite this clear evidence of their error, the seller has neither resolved the issue nor offered me a refund.

I have sought every possible way to resolve this issue reasonably with them, but have not received any adequate response or solution.

Order No.: 8197742405977496

I tried to open a dispute, but I got a message stating that they would not refund my money. I contacted the delivery company. They sent me an email admitting that the POD proof of delivery was invalid and that the package was declared lost. Before opening a dispute, I would like Aliexpress to acknowledge the issue. I have all the evidence, photos, and the email the UNIUNI supervisor sent me.

I would like to resolve this matter amicably. If this problem is not resolved, I will proceed with a chargeback through my bank. The seller and AliExpress must take responsibility for this situation and take the necessary steps to resolve the problem.