Grievance And Complaint For Turkcell

I have been using a Turkcell mobile line in Bursa and have always paid 431 TL per month for my package. When I logged into my bank account in December 2025 to pay my bill for the new period, I suddenly saw that my invoice had increased to 1,061.50 TL. I had not been informed in advance of any change, so this amount was a complete surprise to me. I immediately called Turkcell customer service and was told that my contract had ended a month earlier and that my line had automatically continued with a non-contract tariff. I stated that I had not received any clear notification that my commitment was about to expire. I was told that an SMS was sent at 04:00 in the morning in November 2025 informing me that my package had ended and that they had no obligation to call me. I was also told that I was obliged to pay the current amount and that I could switch to a more advantageous contract for the new period. I find it unacceptable that such a high fee is suddenly and without my explicit approval and that notification is limited to a message sent at an unreasonable hour at 04:00. This approach can cause serious victimization, especially for elderly customers or people who cannot closely monitor their bills, and I find this attitude contrary to customer satisfaction and consumer rights. I request that my non-contractual invoice amount for December 2025, which was issued as 1,061.50 TL without my explicit approval, be updated according to my new contract fee and that the difference between this amount and my usual 431 TL package fee be refunded to me. I kindly ask that this unjust charge be corrected and that my grievance be resolved.