TERRIBLE SERVICE!!!!

HORRIBLE SERVICE!!!! I received an email on 08 March 2019 from Vanessa Vorster that I should pay R651 to release my item(1 T-shirt) which I bought for $42 about R500. I rep**** her email same day asking her how they came up with that release fee and that I will not be paying and should return package as she stated on her email if I don’t pay. I phoned Saturday and Monday, left messages but she never returned my calls or email. I sent another email on 9th & 12th and included Innocentia Sithebe(Clearance Administrator) and Phelencia Goliath hoping they will assist in this matter and no one has bothered to respond. I have received huge parcels for years from US & UK via FedEx and never paid such amount! I asked them how that calculated this “Clearance fee” this time cause just in Dec I received lots of items including shoes and only paid about R1111.00 so how does it work?