Rectification reply from department!!!

Assesse had applied for a rectification of ITR online.

Income was mentioned incorrectly in the original return and a justified deduction was not claimed..

The concerned ITR was filed AFTER DUE DATE..

He got the following reply from Income Tax Department - 

"Your application vide rectification request no xxxxxxxxxx Dated 08-01-2017 for the above mentioned assessment year cannot be rectified at CPC and hence rejected for the reason/s as provided below. Your case has been transferred to the Jurisdictional Assessing Officer- XXX/W/2/31 ,who may be contacted for all subsequent actions against the order passed by CPC.

ASSESSEE HAS REQUESTED FOR ALLOWING THE ADDITIONAL CLAIM OF DEDUCTION UNDER CHAPTER VIA, IN THE RECTIFICATION REQUEST HOWEVER, AS SEEN FROM THE RECTIFICATION REQUEST, THE SAME IS IN EXCESS OF THE DEDUCTION CLAIMED IN THE RETURN. ADDITIONAL/FRESH CLAIM OF DEDUCTION, IS NOT ALLOWABLE. U/S.154, AS THE SAME IS NOT A MISTAKE APPARENT FROM RECORD. ANY SUCH CHANGES CAN BE MADE ONLY UNDER THE PROVISIONS OF SEC.139(5), OF THE INCOME TAX ACT. HENCE, THE RECTIFICATION REQUEST CANNOT BE CONSIDERED AT CPC. THE RECTIFICATION RIGHTS, IN YOUR CASE ARE BEING TRANSFERRED TO YOUR JURISDICTIONAL ASSESSING OFFICER. KINDLY CONTACT YOUR ASSESSING OFFICER FOR THE SAME.THE DETAILS OF THE JURISDICTIONAL ASSESSING OFFICER ARE AVAILABLE ON THE WEBSITE "

Does assessee needs to visit the Assessing Officer or can the assesse ignore this intimation (as the amount to be rectified was not very significant)??? What will happen if the assesee never contacts the assessing officer??