Hardly a scam, but many Caribbean schools have aggressive recruitment practices. If you want them to stop calling, I would recommend asking them firmly to remove you from their calling list next time they call, and tell them if you receive another call you will be submitting a formal complaint at the Federal Trade Commission's National Do Not Call Registry for their New York-based office.
I started getting a TON of telemarketing cold calls immediately after I graduated from medical school (I'm assuming my contact info was released as part of my loan repayment somehow, not really sure), but I had good success with this strategy. People don't seem to like being on government lists as a general rule.