Rider took my money

ordered from naheed through foodpanda today. Initially my bill was 6023. I paid the rider 6080. When I opened my things, two items were missing thus I opened foodpanda to complaint about it and found out that two items were out of stock therefore not sent. I called the rider to return my money as new bill was 4023. He said he will come after 10min but his number became out of reach after that. I got a call from foodpanda rider team asking if my things were delivered, I explained him this situation, he said to complaint on help centre. When I complained to agent on chat, my order status showed cancellation instead of delivered. Agent on chat said that rider team cancelled the order therefore they can’t help.