Turkcell Star+ 15 Tariff Overpriced, Request for Cheaper Plan with More Internet

I have been a Turkcell mobile customer for many years and I am currently using the Star+ 15 tariff on my Samsung A23 line, which I started in Sivas, Türkiye. For the last 9 months I have been paying a monthly bill of ₺845.9 for this package, even though it includes only a few GB of internet compared to current offers. Yesterday my wife and I bought a new package for her Turkcell line with almost the same monthly bill as mine, but with around three times more internet (40 GB). This made it very clear to me that the Star+ 15 tariff I am using is not advantageous and that I have been paying an unnecessarily high fee for a long time compared to new customers and campaigns. I contacted Turkcell customer service and they told me that I am a very old user, so they see me as a “guarantee”, and neither their algorithm nor customer service offered a fair solution to reduce my bills or improve my package. I find it unfair that a loyal and long-term customer is kept on such an expensive and low-internet package while new customers can get much better offers for the same price. I request that my current tariff be changed to a cheaper package that offers significantly more internet, similar to the one we bought for my wife, without any additional fees or penalties. I also expect Turkcell to review my situation and offer me a fair and competitive tariff as a long-term customer.