bad Nike quality and poor service

I bought my sneakers in April 2017 and noticed that the zip is breaking and the material around the zip area is torn. I went into the store yesterday and spoke to the "general manager" Ashley benn who told me their policy of 3 months with the brand Nike. I wasn't happy and asked him to escalate my complaint. He asked me to take pic and email him which I did. He also said that they will not help me and made it clear but I insisted that he escalats. I emailed him this morning for feedback and he said the same thing in his email as yesterday. Does Nike sneakers really only last for 3 months??? Is the quality gone done??? I know this is a factory fault. The entire sneaker upper is genuine leather but the area around the zip is not. Bad bad very bad