My biggest fight was with my phone company, which provides me the phone line and internet. I had so many problems with them to get it connected, and to fix it when the service was down for three weeks. They told me someone would be at home to make the repairs, and they clearly said I would have to be there, and those three times, NO ONE arrived, I had to leave the office at a rainy day and wait there for 30 minutes and no one was there. I had to speak with 5 phone attendants, all absolutely stupid, and yell at the top of my lungs every single cursing word I know in portuguese, and two in english, I had to wish them to DIE on the phone, I had to yell the F word out loud at the middle of my office. Only when I envolved the government agency dealing with communications business I had something done, only when I threatened to move into a legal action.
Oh, but I do get my revenge when they call me and offer me services! Like when they called me offering a call identifier, I pretended to be dumb and asked her to explain me what was it for, and how did it work, and three examples of a situation in which it would be used. Then, I politely asked what was her name and said her voice was pretty. Just as I was going to ask what she was wearing, she politely excused herself to hang up. I love when THEY call ME!