Name Typo on the machine readable portion of Green Card

CP_ISL

Registered Users (C)
I got my green card and the all the information is correct other than there is a typo in my name on the machine readable portion of the green card. The bottom two lines. Eventhough my name is spelled right on the green card.
Any suggestion what I should do. Should I correct this information. If so then what is the best way to do this. The number provided on the letter with green card does not work as it is always busy.
Thanks for any suggestions.
 
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