Check your emotion @ the door
The best tip I can give you is to check the emotion at the door. You can interject a little bit of your disappointment, but anger and bitterness will not solve your problem. It will just turn off the person you want to help you. This is the hardest thing to do but perhaps the most important.
Secondly, keep your problem simple. Don’t go on and on and regurgitate every fact of the transaction. Highlight the problem and focus on a possible solution. Give the company an opportunity to make it right.
Make a plan
Figure out the best way to complain about your situation. There are a variety of options available to consumers these days. Figure out the best plan of attack based on your timetable and expectations.
Be willing to negotiate
Demanding consumers often end up with nothing. When you call a company with a list of demands and threats, it just annoys the company. Consumers think it’s going to scare them into doing the right thing, but it makes them run the other way.
Think about it from your perspective. When someone tells you to do something, you might be less inclined to do it especially if their tone of voice is demanding. If someone asks you to do something in a friendly manner, you’re more likely to do it.
You can let the company know you are disappointed in their service or product or whatever it may be, but do it in a friendly conversational manner.
Don’t expect to get something for nothing. You have to be willing to negotiate, and that may mean you have to meet the company in the middle and pay for half the damage or repairs.