1 Copper

can't activate my win 8

Hello i have Dell Vostro 470 and the Dell replace my last hard disk because it was broke and stop to work it's happend after 2 monthes use and they gave me the hard disk without Win8 pre-installed and i try couple of ways to activate it and no try was success and i call to Microsoft  and they say that i have buisness version and i need to call dell and get a special iso of Win 8 and i cant find that iso in the internet someone's have this iso file?

and i didn't get any recovery disk or somehing like that