Bad Customer service

I am so disappointed at how the 2 ladies that were working at Van Schaick bookshop, Maponya mall behaved on Saturday. On Friday I called and explained to them that I am using a bursary and I want to buy a calculator using the bursary but I will have to top up the payment. When I got there, I gave them my ID book, and the one lady said my ID number is under someone else. How is that even possible. They asked for the account number and I gave them my account statement which had the card number and account number. Instead of explaining things in a friendly way they were shouting and laughing at me. As if I am stupid.

They need to go for customer service training cause they don't know how to handle customers