Monte Carlo Fashions is Jeans losing its color after first use look like D product

I bought a Jeans from SHOP no 75, 1st Floor, The VR PUNJAB, MOHALI
with ITEM CODE-DN-1-36 and the HSN CODE is 62034990
with customer name Roshan and the price 1959 i have bill also. i bought this jeans on 2nd January 2023. But i started wearing this jeans when i am going a trip of manali and after returning i washed my jeans first time suddenly jeans releasing its color lost his elasticity and one more thing a brown or orange thing attached in my jeans with Monte Carlo name and all loosing its color and and brown color got spreaded in my jeans looks very dirty i can’t be able to wear this jeans.
i bought this jeans with my savings only and spend 2000/- in it and i thought Monte Carlo is a branded company so jeans will last till 1-2 years safely but after wearing first time i seen this, How one can trust the company. i want Monte Carlo provide me proper jeans so it worth my Money or they can send their agent to see the jeans quality and how it looses its color . I am adding bills and jeans pictures see cleary is it looking like branded company jeans or 200-300 local store jeans.