How can i remove my parental code and my secret question and i dont know them for Nintendo DSi

How to Remove Parental Controls:
Use the information below to remove any Parental Controls that have been put in place.

1. On the Nintendo DSi Menu, use the stylus to select the Settings ("wrench") icon.
2. Select the right arrow twice to reach the third page, then select "Parental Controls."
3. Select "Yes," to change the parental controls.
4. You will be prompted for your 4-digit PIN. 
   • If you know the PIN, select the empty text box and enter the PIN using the on-screen keyboard, then select "OK" to continue.
   • If you don't know the PIN, select "I forgot," then select the  empty text box for the answer to the secret question and enter it using  the on-screen keyboard.  Select "OK" to continue.
   • If you don't know either the PIN or the secret question, the  Parental Controls will need to be reset.  Please call 1-800-255-3700 for  assistance.
5. Select "Clear Settings," then select "Yes" to confirm.