Not that anyone on here would be scammed but this is clever.
You will receive a phone call with a local code showing. They will introduce themselves and then ask * can you hear me* this is the crucial part because you will automatically answer, yes.
They will then go into a shpiel about what they are selling. They will then edit the call with you saying yes you do want to buy their product.
They will then go after you for the money. It appears that the contract is legal even though it was conducted over the phone.
Wicked Little Letters? (funny film of a long-forgotten case)