There are many resources regarding the subject of how to get what you need or want, unfortunately they are convoluted and often go into a long opinion about the “Art of Asking” which is not necessarily required. There are some things in life that are very simple, and acquiring most of what you need or want is one of them. How do you do it? Just ask.
It may be true that you cannot always get everything you ask for, but if you do not ask, you will not receive. It is also true that certain things require more than just asking, but most of what you seek just requires that you ask. Almost everything in life is negotiable. The top reasons why some people do not “just ask” is they are afraid of rejection or they feel they are being too forward. There is nothing wrong with asking, as the worst that will happen is you will get a “no” but more often than not, you will hear the magic yes word. If you are too lazy to ask, or feel entitled and think everything is just going to fall into your lap, you do not deserve, and will not receive.
The other thing about asking, is you can do it more than once. For example, if you call a customer service person about something and do not get any satisfaction, ask for another person, or call back to get another person. My Wife and I practice this religiously and it works nine out of ten times. It works for us, it will work for you.