Take a look on the forum for mariadecastro. If she is the same Maria that I see post on another forum, she is very good with lots of good and free advice.
She has mentioned elsewhere about how much deposit a developer can keep and what is classed as a breach of contract. As I read it, Polaris World broke their sales contract with you by not providing the second pool. Was it written in any of the promotional material you received?
All the best