Adidas Boston 11

I bought a running shoe Adidas Boston 11 in June 2023, but I have recently start using it twice does month since I was using my other running shoes, Since I used my Adidas Boston 11, its hurting my legs on both sides, I went to the Totalsports in Tygervalley today to return the shoe the assist manager Patricia Frieslaar, she refuse to take the running shoe, because I bought the running shoe in June. I cant even run with the shoe. They will lose on the shoe, I have informed her I am also losing because I wont be able to run with the shoe. Please assist.