Bad quality goods

I bought a pair of Pitbull shoes on 4/6/2015 for work. i only started wearing shoes in July when i started my new work. In Aug i bought inner soles because the shoes was hurting my feet. Middle of Sept i noticed that the new inner soles i bought was also damaged. I then noticed that the shoes soles on inner side started coming through the inner soles i bought. This is now the quality of the shoes??? 1 and half month and the shoes are unwearable? Do they only last a month or 2??? I spend money on shoes i cant even wear to work now and even spend money on inner soles and now have to buy new shoes again?