Instacart review: Delivery order I was charged twice for and never refunded

Ordered 8 cartons of Aldi Iced Coffee at $3.89 per. InstantCart charged me for the original order of 8 cartons but only delivered 5 and charged for both the full order and then for what was actually delivered. When I received the "how did I do" email right after the delivery, I clicked on the link in the email and asked when they were going to refund me the difference but they never responded and never refunded the difference. I contacted them again today and showed them snip-it of my bank acct where they charged me twice and they conveniently said they never receive the complaint and because it was more than 10 days since the delivery, wouldn't refund me so I spent almost $100 for 5 cartons of coffee and no refund for the difference.