I think you must have misunderstood the contract.
In my experience, limited as it maybe, the contracts talk about deposits not being refunded if you pull out. In addition, payments are not completed ahead of time, so I am sure the full amount has not been paid.
There are a number of other items that seem off about this story, but it is not my business, so I will pursue this further, nor will I state as fact any assumptions as others do.