Taco Bell review: horrible customer service 2 visits in a row

Employees who treat customers like we are interrupting their time goofing off will ruin the business.
On 11/10/2019 at 6:00 pm while waiting for my food at the window I asked the cashier Quayshun if I could purchase some extra sour cream, i was told that add on's are not allowed at the window ( 2 cups of sour cream was denied) this happened at the same time she was asking me what hot sauce I wanted .With only me and 1 other car in line this should not have been a problem.CUSTOMER SERVICE SUCH AS THIS IS UNEXCEPTABLE.