lack of accountability and not transparent about costs

I'm quite disappointed with the lack of accountability i experienced from We buy cars sales Exec Julian Lello from the Cape Town branch, We are in a process of purchasing a car and everything was going well, until we made payment, two payments were made one was by our lender and second one by us, we made a cash deposit of R60k and after sending proof of payment Julian comes back to us telling us we have to pay a 1% surcharge fee for cash deposit. i then asked him why we were not made aware of the surcharge fee? and all he said was that he assumed we were going to pay via EFT. he's a sales Exec its his responsibility to inform customers of such! why should i be paying for his assumptions? we are leaving in trying times and every cent counts! and he just expects us to couch up for his mistake, the least he can do as someone who is at fault is to offer to pay half of the surcharge instead of the lame " oh sorry you have to pay"