serial number already use, login forgot

hello

i have a probleme with Corel Draw X8,

My computer crashed and i've decided to install corel on the new one

but after the installation, i cant open corel , it ask to me an account and a password , but i cant remember my account and password, i dont remember what email i put the first time

so i create a new account on corel website and i link my serial number to my new account

but when i open the software i have the message : error this licence number has already been used.

and i cant do anything, 

thanks