help i have very broken english and need to write a business letter

Put your signature in the bottom blank space. If you know the person you are writing to, then use their name, such as Mr. Smith, instead of Sir or Madam. Or you can change your salutation to something like -

To the attention of the Purchasing Department:

Using the real name is best but sometimes you need to be creative.

Best of luck with your business.

Dear Customer:

On behalf of the entire Bobs Companies, a joint venture of 33 firms throughout the Northwestern United States, our thanks for choosing ours--Bob's Southwestern Food--as your current supplier. We also thank you for the time you spent researching our company in coordination with Food and Drinks Research, Inc in order to select the one best suited to your immediate purposes--great teamwork. We also appreciate your recent order and for the opportunity to expand business with John Bane, Inc., one you had suggested as an alternate source for similar products

At Bobs Companies we feel honored that we can also help with your manufacturing process, that is, the one in which you have asked for new ways to package products containing certain lemon-and-orange derivatives. So let us assure you that we will live up that level of trust and confidence in which you have placed us.

Sincerely,
Bill Nauthtov
Vice-President and Temporary Chairman of Reader Response

I thank you very much for your assistance and time to get back to me.
Have a great weekend.
Bob474

You're welcome and please feel free to return if you have other issues - English is not an easy language!

Oh fellas, just one li'l thing, great teamwork