Poor poor service and unresponsive help centre

I placed an order on checkers Sixty60 on 23rd December but never received my order despite the app indicating that my order was delivered 2 and half hours after placing my order. I immediately logged a delivery query but didn't get any response for 2 days despite sending them 3 emails. I finally got an email from *********** 3 days later assuring me that they will look into it. 7 days later am still waiting. I need my money back