Appalling service from Samsung

I purchased a pair of Samsung earbuds. I then asked them to cancel the order and refund me as when I mailed when they'd deliver my package they did not respond. So I decided to cancel. They then rep**** saying the cancelation has been logged. 3 days later they send me an invoice for purchase of the same earbuds. The service is so bad, pathetic and shocking. It's been almost two weeks, refund me my money please!