Turkcell Misleading Tariff Charges

Around 26 December 2025, I was called by Turkcell customer service regarding my prepaid line with the number 5064040***. During this call, I was informed that I could switch this line to a postpaid tariff called “Rahat Efsane Mega 1250 Dk Yeni” for only one month for ₺150, and that after the first month, if I did not renew the package, only the current tax amount under the name of Wireless Usage Fee would be charged. Based on this information, I accepted the offer and my line was switched to the Rahat Efsane Mega 1250 Dk Yeni tariff. In the first month I paid a bill in line with what was told to me, and in the following period I deliberately did not renew the package. However, later I received an SMS from Turkcell stating that the tariff conditions of the package had been changed and that from now on I would be charged ₺20 per month and, with taxes, a total of ₺70. After receiving this SMS, I called customer service, explained the situation and clearly stated that I wanted to return to a prepaid line. The representative at the call center told me that they could not perform this process from their own system and that I had to go to a store to switch from postpaid to prepaid, which meant I would have to pay an additional fee for this transaction. I clearly emphasized that when choosing this tariff, I had specifically been told that “later I would be able to return to prepaid through the call center without paying any additional fees,” and that I had given my consent based on this information. I also stated that this call was recorded in their system and requested that it be reviewed. Despite this, my request was not met and I was unfairly subjected to extra charges. I believe I was misled by the incorrect and incomplete information provided by the call center employee. I do not think that a well-established and corporate company like Turkcell should need to resort to such misleading practices. I request that my line be switched back to a prepaid line without any additional charges and that, at the very least, I receive an apology for the grievance and loss of trust caused by this process.