Error on Green Card and I-90 Question!!

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Dear Friends,
I have received my GC last week. And have name problem in it. My last name is printed as first and first name as last. I have called VSC and they told me to wait for some letter from them before going to local INS (Newark) office.

However form I-90 instructions says that submit this form at local INS office in person. Therefore I am not sure as to wait for some letter from INS or go directly to local INS office.

I consulted my lawyer as well and he suggested me to send the I-90 form to VSC by mail.

I have now confusion as to what way to follow.
If anybody has same issue please share your experience and
give yr comments/suggestion in this matter.

Thanking in advance!