Incorrect Blilling

I have received an invoice and noticed we were charged customs duties which we have never been charged for in the past. <br> After speaking to the owner, he confirmed we have indeed never paid any customs duty and the amount paid needs to refunded. <br> We also noticed that that the incorrect Commodity code was used. On the first page of the SAD 500, the code used is 8473.50.00(6) which is correct as it is the same code on all previous documentation received, but on page 2 the commodity code used is 8544.42.90 (7). <br> Please can someone get back to me. I phoned *** and they referred me to ***and I was told they can't assist me with the above reference NR. <br> The matter was handled by the Clearance Department and a LOA was filled in and sent through. This was on the 04/08/2015. The gentleman also gave me the correct commodity code for future reference.<br> Today I when I followed up on the status of the refund I was simply notified via an email that Customs has rejected the refund. This is unacceptable as this error is between SARS and TNT and should not fall on our company. We need someone to get back to us ASAP. <br>