how to read a batch line by line and write that to a file

I have a batch that uses the record mapper class .I would like to have a custom operation that will write this batch to a csv file .My operation has a batch as its request and I would like to read that batch data to a csv.So far here is  what I have.

Method BatchFile(pRequest As ResponseRBAT, Output pResponse As EnsLib.RecordMap.BatchResponse) As %Status
{
 #dim status as %Status=$$$OK
 #dim inrec as HSCIC.DBS.ResponseRMAP.Record=##class(ResponseRMAP.Record).%New()
 set x=0
    set:$$$ISOK(status) status=  ..Adapter.PutLine(pRequest.%Source,pRequest.BatchHeader)
    //set pRequest.Records.Count()
    while (x<pRequest.Records.Count())
    {
     set inrec.ResponseCode=pRequest.Records.GetAt(1)
     set inrec.PatientID =pRequest.Records.GetAt(2)
      set inrec.MultiMatch =pRequest.Records.GetAt(3)
 
   set:$$$ISOK(status) status=  ..Adapter.PutLine(pRequest.%Source,inrec)
   set x=$INCREMENT(x)
 }
     
 
 
   set:$$$ISOK(status) status=  ..Adapter.PutLine(pRequest.%Source,pRequest.BatchTrailer)
 $$$TRACE($System.Status.GetErrorText(status))
 return status
} 

The GETAT method only write this  5@ResponseRMAP.Record to a file. I am just missing something any help please. I am aware of the built in record mapper that can produce the CSV file but that built in functionality is not doing the job for me as it prints extra characters that make my file not readable by the receiving system