Autodesk Licensing Activation error appeared

Hello,
I am shocked because I paid a lot of money for the Autodesk and now I cannot activate the program. I think I might lost the license because I entered many times and all the time I had the same error. Any solution ? Is there another way to activate the program ?
Thanks !

Autodesk Licensing-Activation error
Registration- Activation Error (0015.111)
There is a problem with the activation code that you entered. Click one of the following links.
