USELES SERVICE FROM SA POSTOFFICE

I received, a mail to pay my customs duty and my parcel will be released, I follow the link and put in my credit card details and all the info required , I receive a pin and entered it . this has been going for the past two days I tried again this morning every time i enter the pin it came back as you entered the wrong. I tried to phone the post office hanged on for an hour ore more line are busy please wait for the next agent phone got cut of. Now I ask my self how incompotent are these people or their system or do they just not give a what ever about their performance or what it causes, previously parcels never arrive but when went to collect they informed me that i have signed for it. useless!!!!!!!!