That's not how that works, that's not how any of that works! What the hell kind of delivery driver doesn't at least try to find the right building?
Some drivers don't even try. I remember a few years ago when I lived in a different part of town, the guy phoned and said he was in front of my door and why wasn't I answering?
I told him I hadn't answered because he hadn't buzzed my suite.
He insisted I lived in a house (I didn't), and I asked him where he was. When he told me, I informed him that never mind the wrong building - he wasn't even on the right street.
He decided to argue about it, and when he finally did show up 10 minutes later, I told him that when a customer tells him where they live, the right thing to do is believe them. Obviously he did not get a tip of any kind, and I made a complaint to the restaurant.
Nowadays... there are two restaurants I order from that don't go through Skip the Dishes. I order from them so often that they're familiar with my orders and very apologetic when a screwup happens with delivery (I still have a $20 credit coming from one of them). As for Skip, the customer service chat line usually works things out, though it's insane how I had to fight with one of them one night, because they couldn't do basic math when it came to my McDonalds order. You'd think they could count to 2, right? As in I order 2 cookies (along with a few other things) and they send 2 cookies?
Nope. And they have no idea how to calculate 5% GST, either, and understand that when you're doing a refund/Skip credit, you have to include the GST, since the customer prepaid that as well.
Whatever this "grubhub" outfit is, it sounds like a very shoddily-run business.