p****l given to someone - an its Not ME!

WAITING AND WAITING FOR A PARCEL THAT WAS SUPPOSED TO BE DELIVERED IN 3 DAYS. AFTER CONTACTING SMART SLIM FOR A TRACKING NR TWICE, I HAVE GOTTEN THE NEWS THAT MY PARCEL WAS DELIVERED AT THE POST OFFICE ON THUESDAY 3/3/15..... AND IT WAS NOT ME!! SO I WHANT TO KNOW WHERE MY PARCEL IS AND WHO SIGHNED FOR IT.... HOW AM I GOING TO GET MY PARCEL BACK AS I HAVE ALREADY PAID FOR IT. OR ARE THE POST OFFICE GOING TO GIVE MY MONEY BACK???? TRACKING NR TC***ZA LAST SCAN 2015/03/03 LAST LOCATION SCANED 054695.