UPS unreliability

UPS claims that I am liable to pay penalties of 5000 rand to retrieve a package that I paid for. I was required to pay customs which I did and sent proof of payment, yet today after so many enquiries I receive an email suggesting that they sent my package which I paid for to USA and I have to pay penalty fees for their fault These people have the worst service ever. ****es me off . NEVER USE UPS ever