Green Trends — hair colouring

Address:

Hyderabad, Telangana

I had few grey hair on the back of my head and I had opted for a ammonia free hair colouring in near by Green Trends Saloon. As it was the occasion of my engagement I was so busy and concerned. They washed my hair and applied colour. After 1 hour, they washed my hair and dried it. I couldn't see any difference and the grey hair were still unchanged. They used Loreal hair colourant. I have attached the video of my hair after the hair colour. I wanted to understand why such kind of things happen here, are you using expired products or what is the issue?