If the value of what you got from them is worth more than what you paid, then they can't just refund you what you paid and say "we didn't mean it". They'd be li

If the value of what you got from them is worth more than what you paid, then they can't just refund you what you paid and say "we didn't mean it". They'd be liable for damages for the value to you of the service and you might even be able to get an order for specific performance. A good example of this is the story of the small number of ticket American Airlines sold in the late 80s/early 90s which offered unlimited first-class air travel anywhere in the world for life. They eventually had to resort buying them back from those customers for rather more than had originally been paid for the tickets.