From everything I am seeing when searching for "halogen transformer" wh2301S, people have been having problems with it since 2009.
It is made by Wang House in China.
There hasn't been any advice offered on suitable substitutes on the sites I browsed.
Might be worth it to wait the two weeks and just use a temporary light. You might be able to expedite it by offering to pay overnight express shipping charges.
There are similar transformers available but they aren't the exact same wattage - either much lower or much higher.