Missing items in food order with no response on emails

I ordered food online last week and 7 items was not delivered. I emailed 3 times, phoned 3 times. I sent a scan of the dispatch note, the driver also sent it on that day. The phone lines are so bad you can't hear the other person. I paid for these items and haven't received a refund. I've used this service many times before and never had an issue. But for me this is an expensive issue.