This series is way too complex. I suggest keeping it simple.

import openpyxl
from openpyxl import Workbook
from openpyxl.writer.excel import ExcelWriter
from openpyxl.cell import get_column_letter
from s4v1 import *

def save_spreadsheet(filename, data_sample):
    wb = Workbook()
    ws = wb.active

    row_index = 1
    for rows in data_sample:
        col_index = 1
        for field in rows:
            col_letter = get_column_letter(col_index)
            ws.cell('{}{}'.format(col_letter,row_index)).value = field
            col_index += 1
        row_index += 1
    wb.save(filename)

>>> import openpyxl
>>> from openpyxl.cell import get_column_letter
Traceback (most recent call last):
  File "<pyshell#5>", line 1, in <module>
    from openpyxl.cell import get_column_letter
ImportError: cannot import name 'get_column_letter'