Tnt express horifying service and incompetence

I used tnt express to ship the shoes I bought from China. They arrived in 3 days at OR Tambo in October 2017 can't remember the exact date. Tnt employee by the name of mariza diederucks emailed and told me the goods are stopped at OR Tambo so I need to provide bank statement showing payment and invoice. I did that same day. She took her time, I called couldn't go through I emailed she never rep****. One day out of the blue she respondent to emails saying customs at OR Tambo says it's understaffed that's why they are taking long to clear my goods. I waited patiently thinking it was possible. A month passed, 2 passed, I started contacting the supplier to ask what is happening. Poor lady was as suprised as I was. Before Xmas an invoice from mariza came through and I was suprised to see how much I was supposed to pay, more that what I paid for the shoes. I asked her like anybody would, regarding how custom calculate customs taxes for imports. She said she doesn't work for customs so she can't answer every question I asked. Really???? She said if I want to "dispute" custom she would advice me to write a formal letter to custom she will send it to them on their behalf. I did write the letter sent it to her but to my suprise she came back to me and saI'd custom will penalise me for non compliance. What non compliance, for wanting to understand how I was charged??? Her service is so horrible and incompetence. I found a supervisor by the name of Cannie, she understood what I was saying and was willing to help unfortunately she went on leave. I decide to pay mariza''s invoice. Today I received a call, so excited to hear it's from tnt I was hoping to be told that my goods are on the way. To my suprised the call was telling me that custom is inspecting the goods and feedback will be given on Monday. How can custom charge me penalty and custom levies before is pectin the goods? After paying then my goods are being inspected? If there is anybody who received their shipment from tnt please contact me and tell me how you did it. It looks like I'm gonna wait another 3 months for Inspection if not more. I even told the supplier to never ever use tnt to any of her clients. It's a company by name, with horrible service and cheating us regarding customs to be paid and penalties.