Nike is not good quality

I bought a pair of Nike trainers as Nike says they are great quality. Only to use them after 6 months for walking the inside of the trainers started tearing away at the heal section. I now have blisters, can’t do my daily walks and need to now again but a pair of trainers. Don’t sell trainers at a high price if the material used is bad quality. This was the first time I purchased a pair of Nike trainers and will be the last. Very disappointing that a big name like Nike cannot deliver on providing good quality merchandise. I have pictures but can’t post here on hello Peter. And when trying to make a complaint with Nike the site booms out what a laugh!!!!