It's amazing the results you can get if you keep calm and reasonable. More often than not, your complaint/problem will be taken care of.
Recently my TV/internet provider raised their rates in what I think is a sneaky way... by not only raising the rate, but by also adding a brand new "fee" and raising all the other various existing "fees" they tack on to my bill. So I called and asked about the new fee that I had never seen before and what is was for, etc., etc. I was nice and polite, even joked around a bit with the customer service person... told her I wasn't blaming her for the rate increase, just looking for an explanation. So she says, "let me see what I can do for you"... she came back on the line and gave me not only a faster internet speed, but also cut $25 off my monthly fee, based on my old rate (the rate I was paying before this new increase!). It pays to be nice to customer service people!