Disgusting Vodacom Shop Service from a Manager

I am currently at the Vodacom Shop at Protea Glen Mall Soweto. The managers name is Amanda. She was assisting me to do a sim swap and I then asked her how much and she said R20. I then proceeded to give her my ID and the R20. Only to find out because I took a contract with Intellicell. I had to call then to get Intellicell to send a letter to vodacom. This was done. Amanda then sid because it's a contract it's now R70. I told her I dont have that money and then asked her for my ID and then left. Only to find out she didnt give me my R20. I turned back and went to inform her. She then told me she didnt take my R20. I told her that I gave her the money. She said to me that if I need money I must tell her. She is now making a huge scene here telking me that I didnt give her the money. I am now giving her R40. This is the saddest service I got from a manager. She doesn't listen, she argues and then tell you not to argue. I've never been humiliated like this from any service provider, let alone a manager. I am totally disgusted and appalled at the service I just received