Amazon DE

I have bought Roborock vacuum cleaner on Amazon.de from UK. After aproximately half a year of regular use (prodact did a good job vacuuming and moping with small glitches) product sudenly started displaying internal ERROR 104 and did not want to vacuum or mop anymore. Since there is a one year waranty I have contacted manufacturer on their website several times with but no reply was received at all. As product is still under varanty I have contacted Amazon for help. At first it seems they were helpful and asked me to return the product from UK to given address in Germany. No paid label was provided but was advised to send it anyways, keep receipt and email it for refund once package is received. I have paid GBP111 for return shipping, however given Amazon depot address in Dresden was not valid and DHL in Germany was not able to deliver package which is now being returned to me. After contacting postal services they have advised that pacakge return will last months if everything is ok with customs clearing on the way back. Contacted Amazon and they apologised for giving wrong address and told me to resend it back to a different address when I received it back(if ever). I am now GBP900 (produt price) and GBP111 (return shipping) out of pocket and don't even know when and if ever package with product will be returned. Amazon is not willing to do any refunds for return shipping to the wrong address they have provided or product untill same has been received by them. There are numerous reports of people returning products from Uk to Dresden in Germany just to be told that delivery can't be made to return address and wasting their money ( https://www.hotukdeals.com/discussions/amazonde-amazon-germany-return-wrong-address-parcelforcedhl-*******). Amazon CS is not willing to pass my complaint to their manager and are giving canned replies that they can't do anything before item is received by them. Very bad experience with manuffacturer and Amazon CS.