Fedex Express is useless do not use them

What a terrible experience we have had using Fedex Express for international shipment the first time. At the beginning of the week 25.3.2019 I was told that our goods were at customs and should be cleared by Friday. By this morning Friday 29.3.2019, I followed up again with the Durban office, only then did Shannon send me the profroma invoice and the clearing instruction. There are costs that do not add up on the invoice. I called at least 20 times to try and get through to Shanon Durman. I tried to get answers from the call centre agent but they could not assist. I eventually managed to get hold of Shanon. She could also not assist with the query and told me that she would ask her boss Nicky Paserus. I never heard back from Shanon, so I tried to call Nicky, The switchboard tried to put me through numerous times but it would ring a couple of times and I could not hear anything as the call was not cut but no one answered. I then asked for a senior manager Sanjeeve and I left a message for him too. In total I have not tried to call at least 40 times since 10.09 am this morning to get a resolution for our issue. It is now 1.27 pm and it is a weekend tomorrow.

I need to get this resolved ASAP as our goods landed on the 19.3.2019 and we need them urgently,

Their telephones are also on the blink. Whilst speaking to someone, one stops hearing the person on the other end for at least 45 seconds and then the person is back. Apparently this is a known problem. How can a customer be expected to speak to someone with this type of call quality. I am blown away by the standard of service Fedex Express