Dissatisfaction

I am very dissapointed with my favourite store...this time around they let me completely down i bought a black short sleeve T.shirt i paid R2150 for this T.shirt willingly because i believe in quality however the amount i spent for this t shirt i regret because when i started to wash it the colour changed even nw it has changed from black to brown! Why pay so much for such? I am really dissapointed and dissatisfied am the customer and should always be happy for what i pay for.