Connotation of "I was led to believe"
I would assume the risk yourself. "I was led to believe" does somewhat imply that you were misled, even if that wasn't the case. Instead, place the potential misunderstanding on yourself to avoid any appearances of negativity or accusation
Correct me if I am wrong, but I believe you have job openings in Singapore.
If they do correct you, you've left them an out for them to do so, while making in clear that your beliefs might be in error.