I am not sure but is okay to write in formal letter
"If you find yourself interested in our offer, please don't hesitate to call us."
Sorry to you Bhaisahab. I have just delated my previous post because I have realized that after "If" you don't use "will" so the sentence "If you are interested..." can have a future meaning. Am I right?
One more thing. When I write on company's behalf can I use "we". For example:
"We are the biggest producer of ......"
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.