My mother, who is near 90, but knows all about scams and scammers was about to ring a line about a scratch card holiday prize. It was a slip inside a magazine and she said it must be okay as it's from a reputable magazine.
I had to get a magnifying glass to read the mall print. She was aware that the call would cost £10
and I could see that you had to give all your personal details and phone number and they stated that it would be used for other marketing purposes.
I can't say you wouldn't get a prize, but my own guess is that you're more likely to get a number one single, though you can be guaranteed to get some high pressure time share sales calls.
Theoretically they could till try to process a payment through on your card, but having cancelled it, you are in a much better position to fight it than if you hadn't. It's likely you'll get more 'offers' based on whatever information you provided, but you should now be aware that nothing comes free and that pretty well all offers that come to you from strangers are scams.