1234, Main Street
Boston, MA 02123
<Recipient Address Goes Here>
I really like to do business with [Company name]. I like the [products/services] of your company.
However, your business operations hours have turned out to be a serious inconvenience for me, and I am finding it very hard to continue as a customer with you..
I have few suggestions for your company. I think if you imply any of these suggestions, we will be able to do business for years to come.
You can contact me on my phone number to discuss the matter. I look forward to speaking with you.
encl: <List of enclosed items goes here>