Incorrect product

I ordered a Hot wheels backpack on the Sixty60 App. The first time the bag was not delivered but I was charged for it. I then had to phone the call centre to request a refund which took days to be refunded. Again I ordered the same backpack but this time instead of the Hot wheels bag they sent a Spiderman backpack. I have emailed a few times and also submitted an issue on the app but no-one has tried to contact me to rectify. My son had to attend school with a bag that's falling apart. It's a week now and I'm still waiting. Very disappointed.