TNT making profits from questionable customs fees

I had a parcel coming in from China. The parcel was cleared and mysteriously it got called back by customs. I then sent the invoice and proof of payment. Suddenly I was told that the problem was the declaration and customs has asked for the declaration to be changed. I paid around R900 but I didn't get the parcel. I spoke to the consulted who confirmed that the issue was that a wrong declaration was made on the clearance documents. He said if the mistake was on my side and the sender we will be responsible and if it's TNT who made a mistake. Then they will be responsible. They then wanted me to pay over R2700 or else the parcel will be destroyed. The sender asked me to pay although I didn't want to.

When I questioned the consultant about the customs penalties. He changed the tune, he said actually the parcel was stopped because the shipping fees were not included in the invoice. I remined him that he said the problem was because customs wanted them to change the declaration. I was forced to pay well over R3600 for a parcel that's not even worth R5000.00.

I have a telephone recording where the consultant mentioned that the issue was that customs wanted TNT to change the declaration and that they have done so. The recording includes the call where the consultant said I the mistake was done by TNT, then TNT will be responsible and if it was me or my supplier then I will be responsible.

Now I want to know how can not including shipping fees on an invoice be an offense ro customs. Customs deal with the products value and not shipping. Can you please give me back my money as it's clear the mistake was made by TNT. I have a recording and I'm sure you also records your calls. You will realise that the first issue was wrong declaration. How does that change to be about shipping fees? THIS IS A ******* AND I WANT MY MONEY BACK. I have read many complaints and it appears TNT always stops parcels and make it about customs when that is questionable. They're making profit from questionable customs fees penalties.