OS reinstall issues for macbook pro 10.8

I have a used macbook pro 10.8.  I erased the macitosh HD and tried to reinstall mountain lion OS*.  Used my appleID but not allowed to download the OS because my appleID does not show any purchase of mountain lion. 
Am I required to purchase the OS in order to continue? 
Is there another way?
*The reason I went about deleting the HD was because the previous owner had an admin. password lock which I lost and clean everything off it. 

Thanks for your reply. Your suggestion reminded me to try restoring from an earlier backup, but no success. An error stopped the restore process and left me where I started.
Password reset.... I should have done more research before doing what I did. No more DIY when it comes to computers.

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