charged double

I purchased at jabulani using my credit card, the store charged me double as per my bank stmnt and I went back to d store to ask for reversal a lady by d name of rachel assist me nd he ddnt knw wht to do and went to ask Busi, when she came back she said \they say u must come back thursday"I asked y she said she dnt knw dat was as per Busi I then asked her several question about my query and everything she said she don't knw"