Definitely give feedback to companies, but remember, it's REALLY hard for companies to take real advantage of you. Unless (1) the company is a monopoly when it comes to the product (which are very, very rare - Apple may be a monopoly on the iPhone, it ain't on cellphones) and (2) the item is a necessecity (and a cellphone ain't a necessecity), they CAN'T overcharge you - because you don't have to buy it.
Seth Myers, of SNL, has a routine about how jaded people can be. To paraphase, "Last week, I was on a plane, and the say over the intercom that the flight now offers free wifi. The guy beside me and I agree that is pretty neat. A half hour into the flight, they announce they are havging problems with the wifi. The guy next to me says, "Man, that's BULLS#!T". Dude, so you don't have access to something that you didn't even knew existed 30 minutes - and you're mad about it?!?"
I can now, for less than $50 a month, talk to anyone anywhere in the U.S. for as long as I want, when I am pracically anywhere in the U.S. 20 years ago, I couldn't get that kind of a deal on a landline, much less a cell phone. That's awesome! Sure, the cell companies make a mint on texting, but 20 years ago . . .oh, wait that didn't exist back then.
Sure, society is in a downward spiral, and the government is slowing taking away our freedoms . . . but as far as businesses go, they are awesome. Think AT&T or Exxon make 'too much' money? Don't use them, and/or, better yet, invest in them and reap the benefits of other peoples' complicity.
(I've been listening to a lot of Ayn Rand, recently.)