If the complaint meets BBB guidelines, it will be forwarded to the business within one to five days. Also, the letter should state that you are, in good faith, seeking the cooperation of the company in the matter and that if the issues remain unresolved you will seek formal dispute resolution assistance.
This is because your initial anger and emotions may be expressed in a negative way with rude words and those sorts of letters will not get results. Talk to the business first.
Your document is free within your one week membership trial. Know what you want. Personal comments and accusations are rarely helpful in reaching a resolution. If you have an issue with a product or service, you can use a Complaint Letter to a BBB or Attorney General to help resolve the matter.