10kt Gold Sapphire (created) Pendant Necklace w/ 18" Gold Filled Chain new

Have contacted this seller more than once and we are not receiving communication from their end. They still have not shipped the necklace we purchased on the 1st of June and it is now the 7th and it still has not shipped and they won't give us our money back or communicate with us as we have sent several messages asking questions regarding the necklace and refund.we would appreciate communication regarding a refund and our messages are getting left unanswered