I came to the salon for my first time ever. I want...

I came to the salon for my first time ever. I wanted all over black hair and to trim my hair. It had been 1 year since I had a trim bc hairstylists make me nervous and I am desperately trying to grow my hair but due to health conditions, this is very difficult.
The stylist Mandy cut my hair into a bob. I was shocked but i tried to not get emotional. The black color did not take and my hair was still red. I went home super upset. 2 days later the manager fixed my color. However, I still have brown pieces all underneath my hair. I didnt bother crying about the length bc nothing can be done. The layers are choppy and do not blend well. In order to fix that more needs to be cut. I can't fathom it. I actually have to straighten or curl under the ends now...I am forced to style my hair and I had stopped using heat tools altogether for the purpose of strenthening and growing my hair.. I can't now and bc I have serious medical conditions it will be years to get those inches back. This was a terrible experience. I will not Ever use their salon again. I paid 120$. I wish i had not ever go into the salon.