Incorrect Information and Lack of Responsibility by Turkish Airlines Leading to Customer Inconvenience

In the past month, I spoke with approximately 4-5 customer service representatives who informed me that I could change my ticket by paying a change fee of 70 USD and additional fare differences. However, just 2 days before my flight, I was told that changes to different routes could not be made and that the customer representative had provided incorrect information. I requested feedback and asked for all my conversations with the customer service representatives to be reviewed. Despite the misinformation given by 4-5 representatives, THY did not take responsibility and did not change my ticket. Customer service is the face of a company; one person may make a mistake, but if the company fails to properly inform and train 4-5 people, it should take responsibility and make the ticket change. Being told 'sorry for the misinformation' just 2 days before my flight is unacceptable. I had planned everything based on the information and changes provided over the past month, and not being able to make this change at the last minute has caused me significant inconvenience. It is disappointing that a company like THY does not take responsibility for the mistakes made by its customer representatives.