poor service from Fedex agents

Im very disappointed with the services of Fedex,the lack of customer service they have is appauling really..I have a shipment from China,with Waybill no: ********** 24281.I was told to pay a fine of about R2350 by a Clearance Admin Devone Papagni,but on the 29th March late i received an email with an invoice of R1517.01 from Vanessa Voster to pay towards Customs,I did pay the amount on the 02 April due to the longweekend.Now im being told that on top of the R1517.01 i still have to pay another duty fee but then the invoice sent by Vanessa Voster has everything written on it.lastweek i called to ask whats the progress on my goods since I had paid the customs fees and Devone said they should be cleared by lastwerk Friday and hey IM STILL WAITING..Today I tried calling him and even sent an email , I got no response from him.I then called the Call centre,spoke to a lady called Leoney(not sure of spelling) She said she will call me in an hour with feedback,till now im still waiting.My biggest worry now is if they even have my goods or did they loose them?I want to know what is going on,because i paid customs and registration has been done,so what is the hold up really??and why are they not responding and not giving feedbacks,its really annoying to get such service.