Unsatisfied customer

I use Mr D food regularly their consultants are generally friendly. But I do feel like they could do more for their unsatisfied customers other than giving out a discount voucher for your next purchase, which by the way I think is another way to get you to order again. On the 14th of August I ordered 2 items from KFC through Mr D and I only received 1 item. I launched a complaint with Mr D on the very same day and I was told I can only get a discount voucher to use on the app on my next purchase. Firstly what gives them the idea that I’m going to order again, what if I don’t want to order again, than I lose my money. I made it clear to them that I would like for them to liaise with KFC and deliver what was missing from my order, I even explained that it’s for my daughter but all I got was that they can’t do a reorder for the previous day’s query, even though I communicated with them on the very same day. It’s disappointing that they have a general way to fix mistakes instead of catering for individual customer needs, furthermore the driver should be able to check the customers’ order against the receipt before leaving the shop, because they represent me the customer. I’m very upset as I feel ******, I’m sitting with a discount voucher which is not what I ordered.