Turkcell Platinum Contract Ended - No Notice High Bills Charged

I have been a Turkcell Platinum subscriber for about one year and my line with the number 5389109*** is defined with an automatic payment order from my credit card. Although my contract period ended, I was not called by the call center and I did not receive any information via e‑mail or SMS about the end of the commitment or that a different fee would be reflected on my invoice. Despite this, I realized that very high amounts have been reflected on my invoices for months and collected from my credit card without my explicit consent. When I called the call center today regarding this issue, I spoke with an employee named Ms. J*** During the call, instead of clearly answering my questions and helping me create a complaint, she stated that my permission to be contacted and data sharing was not open, then suddenly said “oh sorry, it is open”, constantly changed her statements and ended the call without helping me. The inconsistent and unhelpful attitude I encountered was extremely disturbing and not befitting an institution like Turkcell. Later, I was informed that my contract had expired and after this date higher amounts were reflected on my invoices. However, I was not given any prior information that my contract would end or that additional/ higher fees would be reflected on my invoice, and I did not give any approval for such high charges. For this reason, I object to the collections made without my knowledge and consent. I demand the urgent refund of all excess amounts that have been collected from my credit card without my consent on my Turkcell Platinum line since January 2026, including the excessive charges reflected on my invoices for January, February, March and also the invoice reflected in April, and I request that all necessary checks be made and the unjust increases be corrected.