Respondent submitted modified document in form of photocopy to prove their point

Photocopy of the document is not admissible as evidence.

The photocopy to be admissible as evidence has to be a certified copy. No reliance can be expected on a document which is otherwise inadmissible in a Court and. that whenever "document" is referred in an order or is required to be produced, it must satisfy the test of admissible documents viz. original or secondary as provided in Sections 64, 65 and 66 of the Evidence Act. Further, the Supreme Court of India in J. Yashoda Vs. K. Shobha Rani, AIR 2007 SC 1721 : has held that secondary evidence admissible only in the absence of primary evidence when proper explanation of its absence is given. 

Sir,

The Company has submitted in Counter with the Affidavit in High Court all the modified photocopy documents which is clearly visible in the documents like placing some paper on some points and taking xerox copy and submitting in court

Photocopy can not be taken on records as an exhibit unless the absence of original copy can be satisfactoriy explained as responded above. The courts in India follow the best evidence rule to admit a document as an Exhibit.

In the high court they have submitted the photocopy of the documents, which can be objected at the time of arguments and original document may be demanded to be produced or to reject the documents.

Without knowing more details or perusing the case papers, any opinion given in furtherance would be a misguidance

There cannot be any meningful suggestion unless the documents are perused and issues discussed.