This happens virtually everywhere. I hate it. This is such a common experience with any sort of providers as well. I called up my ISP because the internet speed was worse than what I was paying for. They "fixed" it. So far so good, but there were times when they did not want to do this, they tried to "rationalize" it away using bullshit pseudo-technical sentences thinking that they are talking to someone who knows nothing about computers and networking. Anyways, I told them that I am going to switch to another ISP, and after that they fixed it. I finally got what I am paying them for. Imagine how many people are not... without knowing about it!

Plus what you said specifically happened to my mother. Her employer knows that my mother is one of the best she has as an employee. My mother asked her employer for a higher salary, she refused, but after my mother said that she will be looking for other jobs because the work is too much for too little, she immediately was willing to negotiate a higher price.