Can I use one spell multiple times
If it doesn't say somewhere you can, then you can't.

Unless either the card itself or something else in play says "...you can cast this/that multiple times..." then you can't.

Either you're misinterpreting what happened in that game, or that game is not made to play with the same rules as Magic.

Seriously - best rule to go by - Unless it says you can, you can't.