Bad advise lead to a ripoff on my billing

I contacted UPS on the 28/04/2015 as I needed them to do an international collection for me and did and enquiry with them. I was assisted by Nonzuzo who explained the process to me and sent me documentation to complete. i completed the documents and forwarded back to her. on the 07th of May i sent an email advising that the amount of my package is now less by one and if she could update the billing and was advised that it does not matter as this is an estimated amount and when they weight it in the USA they will alter the price and advise. No one has advised me of the charge till the package arrived in South Africa before I could accept the R4200 fee till Monday the 18th when the goods arrived in the country. It took UPS two weeks to deliver without any explanation as on the quote they advised it would be 2-3 working days. I complaint to Sham and Vuyo about this miscommunication that they charge by the box size not the actual weight of the entire box as Nonzuzo advised that using one big box would be cheaper than single small boxes of shoes of which it is not it's actually more expensive. Initially quote R2700 subject to change and I would have an opportunity to accept or decline.