Shell Sold Me  1-Liter 10x40 Motor Oil Way More Expensive Than Others

I bought Shell's 1-liter 10x40 motor oil for 240 TL at one station and 136 TL at another. I found this price difference too excessive, so I first complained to the station that sold the expensive oil. They said "Free Market". Then I informed Shell about this situation. Two days later, a customer representative called me and said that this was natural and that I could buy it from another station for 300-odd liras due to the "free market economy". While I was trying to explain that I was shopping by relying on the brand's corporate identity and that this situation was unacceptable, she constantly interrupted me. "I already called to inform you, there is nothing to be done about this issue," she said. In short, she insinuated that I was talking in vain. When I told her that I was trying to express my complaint as a customer, she continued to interrupt me over and over again despite my warnings. I stated that I did not want to talk to her due to constant interruptions, and she hung up the phone saying "OK then, have a nice day". From now on, Shell is a brand I will choose to stay away from. I wanted to let you know if there are those of you who think, as I did, that "there is no price difference between stations, it is standard".