Refunds on iTunes purchases

I just accidently downloaded a whole album instead of a single song which is on the album. I've reported the problem to Apple on my purchase history and explained the situation. What are my chances of getting a refund on the purchases?

0.001% you could be lying to them && they can't exactly take the purchase off you computer so you not gonna get one, i've gotta this issue with a film i accidental purchased instead of previewed..

To be honest, it has happened to me on repeated ocasions. Got refunded every time. or song credit, whichever you prefer.