DHL Dhl express Dhl charge me wrong weight, and refused to issue refund. Internet

 I went to Dubai and bought some stuffs for my business. I took everything to dhl office and the package was weighed and I was given the price to pay in cash, which was a little over $2000, I complained bitterly about the rate sincere my dhl agent in Elizabeth Nk, told me the more the weight, the less the charge per kilo. The agent then advised me to use my dhl account to get a better rate, which I did. I returned to the Usa and await my package. Alas, Dhl went ahead and charged my credit card for 319.50kg. The package was weighed in my presence and it was 200kg. How did it end up 319.50kg. I called Dhl billing and made a complain, the agent told me to call my rep in Nj. I called him more than 8 times over a period of 3 days and left him messages. He never called me back until this moment. So I resort to sending him emails, which he finally replied and said he will work on my dispute. Meanwhile, dhl sent me an email that the case has being closed without issuing my refund. I still have the packages in my store, clearly printed on by dhl as 200kg. Yet, dhl rip me off and charged my account for 319.50kg.