VBA, excel : deleting/inserting rows , no errors, no result

Who can help/analyse? tried all kinds of statements but rows are not added/deleted. Below is not the most effective way in VBA but I had to find out why statements do not process without giving errors. I am using tables (listobjects) so I do not have to use cell/row adresses that use column-letters or row-number.

(Have excell-sheet available, do not know how to attach here)

Function TableResizeInRows(SheetName As String, TableName As String, NumberDataRows As Integer) As String
'NO ERROR BUT ALSO NO RESULT
Dim l_Tableref As ListObject
Dim l_SheetName As Worksheet
Dim l_range As Range
Dim l_ListRows As ListRows
Dim MyNewRow As ListRow
Dim c_ListRows As Long
Dim InsertIndex As Integer
Dim DeleteIndex As Integer
Dim HeaderIsOnRow As Integer
Dim StartWsRow As Integer
Dim EndWsRow As Integer
On Error GoTo ErrorHandler

If (NumberDataRows < 2) Then
    TableResizeInRows = "Row 1 not to be deleted, formulas will be deleted too!"
    Exit Function
End If

Set l_SheetName = Worksheets(SheetName)
' make goal-worksheet active (set correct context)
l_SheetName.Activate
' Define Table Object
Set l_Tableref = Sheets(SheetName).ListObjects(TableName)
' determine # rows in listobject
Set l_ListRows = l_Tableref.ListRows
c_ListRows = l_Tableref.ListRows.Count
' determine rownumber on which the table is
HeaderIsOnRow = Sheets(SheetName).ListObjects(TableName).HeaderRowRange.Row
' Now we have sheet-rows that should be deleted/inserted
If (c_ListRows > NumberDataRows) Then
                ' We have to delete rows but it should be (the last row) of the listobject (Table)
                ' EndWsRow = last row that is to be deleted (lowest row#)
    EndWsRow = (HeaderIsOnRow + NumberDataRows) + 1
                ' StartWsRow = First row that is to be deleted (highest row#)
    StartWsRow = HeaderIsOnRow + c_ListRows
    For DeleteIndex = StartWsRow To EndWsRow Step -1
'NO ERROR BUT ALSO NO RESULT
'        Set l_range = l_SheetName.Range("A" & DeleteIndex)
'        Range("A" & DeleteIndex).EntireRow.Delete
        Worksheets(SheetName).Rows(DeleteIndex).Delete
        'l_Tableref.ListRows(DeleteIndex - HeaderIsOnRow).Delete 'Based on row in table 'results in error 1004
    Next
    TableResizeInRows = "Success, rows deleted?"
    Exit Function
Else
    If (c_ListRows < NumberDataRows) Then
                ' We must insert directly below the listobject (Table)
                ' StartWsRow = Last row of table after which a row is to be inserted(so last rownumber on sheet that contains tablerow)
        StartWsRow = HeaderIsOnRow + c_ListRows
                ' EndWsRow = Last row after which one more row is to be inserted
        EndWsRow = (HeaderIsOnRow + NumberDataRows) - 1
        For InsertIndex = StartWsRow To EndWsRow Step 1
'NO ERROR BUT ALSO NO RESULT
            Worksheets(SheetName).Rows(InsertIndex).Insert Shift:=xlShiftDown, CopyOrigin:=xlFormatFromLeftOrAbove
        Next
        TableResizeInRows = "Success, rows inserted?"
        Exit Function
    End If
End If
TableResizeInRows = "Result unknown"
Exit Function

ErrorExit:
    On Error Resume Next
    Exit Function

ErrorHandler:
' Public Function bCentralErrorHandler
' see https://stackoverflow.com/questions/19042604/vba-excel-error-handling-especially-in-functions-professional-excel-developm
    If bCentralErrorHandler(msMODULE, sSOURCE, , True) Then
        Stop
        Resume
    Else
        Resume ErrorExit
    End If
End Function