ITIN Rejection

Hi, 

I filled my tax return at IRIS assistance center with my I1040 and two W7 one for my wife and other is for my son. Because my wife and son came to US in last September. Today I got letters, one letter is for my wife ITIN approval and another Letter for son ITIN rejection CP567. I know I mistakenly added my son for ChildTax credit. so what should I do in this case?