Wimpy city view mall Durban

Hi guys I visited wimpy on sunday 02 /12/2018 for lunch. My hubby and I ordered fish and chips. When i recieved my order I requested to the Waitron can i please have peri peri sauce. 2minutes later the peri peri sauce was given in a normal plastic squeeze bottle. A minute later another Waitron came by table to take the peri peri sauce to another customer. It was completely fine. After done with our meals I requested the bill. As I am going through the bill I noticed Peri peri sauce R9.90 served in a tub. Initially when i requested for the sauce the Waitron never advice me it will be chargeable. When i did question the waitron the peri peri sauce is charged at r9.90 a tub and I recieved it in a normal sauce bottle. Waitron said to me for breakfast we don't charge for peri peri sauce only at lunch we charge for peri peri sauce. I have been to many other wimpy restaurant throughout the Durban area and haven't charge for the peri peri sauce. Some wimpy restaurants even go an extra mile to provide the customers with many other peri peri sauces. This is the first time experience and worse experience. I even taken out a photo of the bill stating peri peri sauce r9.90 served in a tub