1234, Main Street
Boston, MA 02123
<Recipient Address Goes Here>
I wrote a letter [date] to you requesting a response to my first letter [date].
I have not got any response for any of these two letters. I wrote it clearly that I am highly dissatisfied with your services.
[Describe Problem here]
I have not received one single reply from your side.
It seems that your company is not serious about its customers. It does not care about the customers and it makes me decide that I should never do business with you people.
However, it does not mean at all that I have forgotten the matter. I still want the solution on my problem that I faced with you at the earliest. And, if I don’t get any answer from your side, then I will reach the higher authorities.
encl: <List of enclosed items goes here>