Contract Existance

You are at the train station waiting for your train to arrive. You see a vending machine from where you can buy snacks and chips for $3.50. Posted on the machine is a sign saying: “Property of XYZ Vendsolutions Pty Ltd”. You insert the coins required into the machine and out comes a packet of chips. However, when you open the packet of chips, you find bits of plastic inside and you don’t want to eat the chips. You want your money back.

I got this scenario online and I wanted to ask tutor who do we have a contract here, with the vending machine company or that company manufacturing chip and what is the basis so that we can say this is a legally binding contract?