Taco Bell review: Customer Service, Incorrect meal

Drive through- I ordered 2 spicy potato soft tacos, I was told the the amount of 2.14, but the customers order in front of me was still on the screen when she asked me to pull forward. I got the window and was told $1 and some change, I told the cashier it was suppose to be 2 spicy potato soft tacos, and she yells to the kitchen that ‘she wanted two of those spicy potatos' I can hear the kitchen staff complain. The cashier gives me the new total (again) $2.15, I handed her $2.29 cents (1 quarter 4 pennies) she takes the money and I wait a few minutes. She then hands be the bag and I asked for my change, she gets upset with me why did I hand her way more money than it was suppose to be. I told her what I handed her and she argued with me saying I gave her more than that. Anyways, she ends up giving me my correct $0.15 back with an attitude. I didn't get a receipt and it turns out I only got one taco. If I had the time to go back, I would have. Unacceptable.