Thank you for your replies everyone. I'm guessing that I bought them over two years ago. I'm sorry, my health condition affects my memory. I can never give precise answers, especially when it comes to dates and timelines. Two years may seem like a long time, but since they are snow boots, it's only for a short time in the year that I actually wear them. For the mileage I've covered, they should have lasted longer. I'm a slow walker as I have fibromyalgiya. So again, it's not like I've been very active/hiking in them. Is it ok to post picture here to explain exactly what the damage is and why I feel it shouldn't be classed as wear and tear but a fault with the material used? Thank you.
Edit: They were £60. They have been redesigned and priced at £80 now. Oh and another thing. When I first bought them I left a review on the website. It would have been a good way to determine the date of purchase. However there's no reviews on the website anymore. I am wondering if others experienced the same problem.