Documents inadvertently admitted by advocate for plaintiff

The advocate is not the authority to admit the documents filed by defendant. 

If the documents were permitted to be marked as exhibits on the side of the party relying upon them,  the opponent can very well challenge the documents during cross examination and get them nullified. 

Therefore you first analyze what exactly is the problem and revert with proper question if you want proper opinion. 

Thank you Sir,

The invoices admitted by the advocate are  now exhibited since admitted. The Defendant has not proved the contents of those invoices as those invoices have been admitted by Advocate of Plaintiff. 

Current statge is of final argument. What remedy is available Sir?

If the documents were not admitted or nullified during cross examination then it can be taken up during arguments stating that the documents produced are irrelevant hence the case depending on the said documents stands not proved and liable to be dismissed. 

Whereas it is not known what happened during cross examination hence you may have to clarify the same by a second opinion from another lawyer and proceed as suggested.