Terrible service

My boss sent a laptop to me to start working, for some reason Courier Guy adjusted the pricing AFTER the parcel was picked up. The additional charge was only brought up when the driver was delivering the laptop to me, and the driver couldn't tell me how much it is, he called the office and they also couldn't advise and I had to contact the operations team. I first made contact with The Courier Guy Nelspruit yesterday (the 7th of June) at 14:05 to find out what is the issue and to try and resolve it ASAP. Today (the 8th of June) I had to make contact with The Courier Guy again as they failed to get back to me, I asked them to send me the banking details so that I can just pay the unjustified extra amount and get it over with, to which I was referred to the kiosk, but as with all of The Courier Guy Nelspruit's phones, nobody even bothers to pick up the phone - great, so I must pay the extra charge but I can't get the banking details.