Vasanth & Co — Electric rice cooker purchase. Not explained by sales person leading to wrong selection

I purchased a one litre electric rice cooker Panasonic brand from your gandhipuram Coimbatore branch.. The cooker does not have warming option.. As usually rice cookers come warm option. I presumed the same would be the case in this cooker.as well. When i found that the cooker did not have the warm option, I called the show room and asked for exchange., but it was refused. I am ready to pay the extra amount for the higher model.. The sales person did not explain the option at all.. I request you to do the needful