In this case you can post the bet ID of the bet and for sure somebody from Unibet will credit it if everything it's ok. Put I must say it's strange, I receive instantly when I place the qualifying bet.
Maybe you already played freeroll last thursday? You get one ticket if you make bet between tuesday-thursday and another if you place bet friday-monday, no more. And bet min stake has to be 10€, several bets with lower stake don't do the trick.