Spykar — spykar white shirts

Address:

Rajkot, Gujarat, 360005

Hello,
I have purchased spykar white shirts before 3 months. I wear once and after washing and irony i put it in my wardrobe and wear today once again but found a steaching near both side of button is converted in to black. If i am purchasing expensive shirts and after washing 1st time only, steatching colour is changed it means your stretching is not proper or string quality is not proper.
Please help me to solve this problem.