Late delivery

I ordered and paid for a pizza online from Debonairs Dawn Park on 29/06/19 at 18:03, I called the store with no answer. An over an hour later a manager called & said it's on the way freely.It was delivered at 20:17. I complained on their online & Twitter. They gave me 2 case numbers and that I will be contacted. I kept trying to follow up as they say" if the sticker is black it's free". It's November now, no one has contacted me nor have I received my refund. It's like they want you to give up so they don't honour their promises or just plainly careless about their clients.