OnTel Products review: Rocket grill

My Dad ordered a Rocket Grill on their website today, 9.23/26 just before 11 am.. He accidentally clicked on "2" and couldn't back out of it (he's 90 so we need to cut him some slack. As soon as the order went through, he called them at the number on the email confirmation and said he only wanted one. They refused. He said to cancel the order. They refused and hung up on him! This was charged to my credit card. We simply want to cancel the order. This shouldn't be that difficult.