There are many times in business when you need to ask for basic information or more information than provided.
The first rule of business correspondence is that a standard letter format saves time and effort.
Keep any letter of inquiry simple, just asking for necessary information.
You only need a basic letterhead and a few lines referring to the subject.
These ready made letters are particularly useful when you're shopping around for commercial products. You can send several letters or emails and only have to change the addressee.
The example below is a letter from a retailer which includes a question for the seller as well as a request for standard information.
Re: Digital camera servicing and repairs
I refer to the recent advertisement for your services in National Camera Magazine. Please forward a list of your services, charges and franchise operators in our area.
Question: Can you service older digital cameras, and do data recovery from disk memory?