Samsonite Centric 28" Spinner- Checked

Bought in May. All was well when I ordered, and item came as described. However since using it twice, I am SO SO SO disappointed with a Samsonite bag. When I first used it on my trip in May / June - the zip was not as smooth as expected when I opened my bag - it gnarled; but after opening and closing the zip a few times, it "corrected' itself and I didn't think anything of it. On my recent trip just this late October, the bag zipped fine as I was packing - but upon arriving at the hotel in my destination country, the zip was completely opened. Good thing I had a luggage cover or my personal items may have been lost. I am not able to return the item. There is no Samsonite service center where I live, but a department store here said they will assist me to send it overseas to the nearest service center; but they warned me that zippers are not part of the 'warranty'? And that I may have to pay for the replacement - and they are also not sure how long it will take. What's the point of a 10 year warranty, when upon using an item twice, it is damaged. I am not able to return via Amazon, and get a refund or replacement.