Had the displeasure of dealing with company as my ...

Had the displeasure of dealing with company as my parents were with them for car insurance. Astounded that this company actually exists with their appalling customer service. Afterwards tried to make a complaint and there is no email address! Called the complaints department and was told no one is available. Took my details down and said would get back to me- and no answer!! how can I report a problem about the company when the complaints department won't respond??! I am getting my folks to change insurance companies.