An unsatisfied customer. (Bad customer service)

Before the lock down, Nando's charged me twice for my one meal, when I emailed them about my issue 3x, they did not respond. Later on I called them, they said they'll log in my complaint, do a follow up and get back to me the next day around the afternoon as well as give me my references number, they did not do what they promised me they will do, since then I've emailed them and no one has contacted me since.