haha.
The same thing happened to me with Alra a couple of months ago. I'm starting to think we might have the same agent. Was it the Alra off Gaona ?
Anyway. I wouldn't worry too much. You'll get the car, eventually. It is a little infuriating since they promise 7-10 business days ( 15 days approx ) and it took them just about 30 days total to deliver my car but it is what it is.
You need to contact the central office on Juan B Justo and talk to the person you dealt with when you were there. They almost never answer calls. The phones just ring and ring. You need to go down to the office with all your purchase paperwork and receipts and request a more specific delivery date. Although if it's been a month already, it shouldn't take more than another week or two.
Sit tight. You're car will get there soon enough.