Nike — quality not up to the mark

I have bought nike flex shoes a week back. After some regular use the material started to wear off and now it's torn. I had to shell out a good amount of money there, and the quality is not up to the mark.
The shoes are in no way mendable and are just a waste now. Simply put not serving their purpose.
Not expected this from a huge brand and i am regretting buying nike.
Hoping to have a possible resolution, to keep the brand's goodwill intact.