KFC really doesn't care

So this review is for KFC customer service as a whole. Laid a complaint after I received food I was not satisfied with and after a week they called me,First of all the agent who called me thought I was only looking for a voucher for free food because he wasn't interested to know what was the issue quickly offered me a voucher however when I declined it-the couldn't offer me any service. He then promised that the Arbour crossing manager would call and assist me of which it's a week now awaiting for someone to call me. So if KFC encourages the survey partake but doesn't do anything nor willing to know where they can improve, what is the point?