Apalled by the service

Really disappointed with the customer care i received. I bought a smart watch in NOVEMBER and it wqs defective. I returned it and they sent me another one. The 2nd one refused to even come on. I complained. After 3 emails i received a waybill and it was supposed to be pucked up on December 17.to date nothing has been done. I emailed Hyperli about 4times to check on the matter. No one emails back. I WANT A REFUND AND I WILL NEVER BE USING THIS PATHETIC SERVICE AGAIN