Killer Jeans — quality

I bought a killer jeans in the month of may 2018. I gifted it to my husband. He hardly wore it for 3-4 times. But to his dismay the texture worn out even though we use liquid detergent for washing our delicate cloths and dry in shade. I am herewith attaching the photographs for your kind perusal. The jeans was bought from kalyan silks, cochin. Requesting you to look into it and arrange to replace it.