Locate the physical addresses of those you wish to file the anonymous complaint(s) with. If you wish to file the complaint with the grocery store itself, find or ask for the address to the corporate offices for the store if it is part of a chain. If the grocery store is not part of a chain, look up information on the store to determine the name(s) of owners. You may also wish to research local newspapers or television stations to see if any coverage is dedicated to the type of complaint you wish to file.
Draft your letter(s) of complaint. Be sure to detail exactly what you are disgruntled about. Explain your experiences and thoughts clearly and succinctly. If you are still upset about what occurred at the grocery store, it may be best to take a break from writing to be sure that you are delivering your message as coherently and professionally as possible.
Conclude your letter with your desire to remain anonymous. Oftentimes, managers or owners want to contact the customer to discuss the complaint that has been filed in more detail. You may wish to note why you are filing anonymously to ensure that your letter is taken as a credible and serious matter.
Print your letter(s) of complaint. Send the letter(s) to the addresses that you researched previously. If you wish to remain anonymous, be sure that your name and address is not printed on the envelope or letterhead that you printed your complaint on.
Use the Internet to research options for filing anonymous public complaints about the grocery store. If you would prefer to file a public complaint, you can research several business review sites where you will be able to post your complaint anonymously. Yelp.com has become a popular site for reviewing and submitting complaints about businesses. Yellowpages and Superpages also have sections where anonymous customers can post input.