What's up at FedEx Express?

This is my second complaint about FedEx Express in as many months! I had a parcel arrive in South Africa on 13th February with urgent stock for three of my clients. When it arrived, FedEx unilaterally changed the accepted international HTS code for stickers, that was stated on my supplier’s Commercial Invoice, which caused customs to inspect my parcel and fine me for using an incorrect code. There was no reason to change the code without FedEx knowing what was contained in the parcel, or discussing it with me first. It took 16 days to receive my parcel, for which I had paid dearly for an ‘International Express’ service. I don’t believe that I should have been punished with this fine and I do believe that I should be reimbursed. To add insult to injury, I have tried, via three people at FedEx Express to discuss this matter and my emails go unanswered. What’s up with you guys? You display the same apathetic arrogance as our government departments! Proof of emails and to whom they were sent are available on request.