Have you ever got a complaint? If you live alone, you will never get it.
I will tell my experience.
Promoting means inviting them to join to be your customers. It is common promising a lot of sweet things to impress people to be customers. Some companies considered it before promote their products or services, and the rest is not.
A seller sometimes or even talks mostly more than the fact of the products or the services. Then people think that they will get more what they want.
I have some experiences in this account. I was a buyer or a user. I did not get what the seller said before. I also get it when I worked in a company. Some clients complained and I could do nothing rather than just blamed myself.
Just now I had some guests. They are men, co-worker of a national company in my country. I have complained a lot on the fans page about the service. But I did not get what I want. Then yesterday the problem happened again. It has been more than 5 months with the same problem. I sent an email with a little expression of anger. They came to my house with a so serious facial expression. I welcomed them. I thought they would be angry, but I was wrong. But no smile.
I questioned how the company recruited the employee on that email. I think I am wrong. But that's me when I felt disappointed about the service.