Does not respond to customer complaint

I sent an email about an unsatisfactory product to their consumer service email address - the automated response stated that I will be contacted within 24 hours. Email sent on 02.03.20 and it is 05.03.20 today - still no response. A simple apology would have sufficed. They clearly don't care about the satisfaction of the consumers who support them by buying their products. I just think it is unprofessional that the email was ignored.