I recently subscribed to a Turkcell Superbox service with modem model MC8520B in Adana Seyhan, and the installation was carried out on 8 May 2026. From the first day, the internet speed was far below what had been promised during the application. Despite this, Turkcell opened several complaint records after my calls and then repeatedly informed me that the issue was “resolved,” while in reality the speed problem continued exactly the same. To better understand the problem, I tested the connection by comparing it with a regular phone using a Turkcell SIM card connected to the same base station, and the phone consistently delivered higher speeds than the Superbox. Later, the technician sent me a visual claiming that with this 5G technology the maximum achievable speed is 25 Mbps. This limitation was never mentioned to me when I applied; if I had known this, I would definitely not have subscribed to this service. I explained all of this to customer service and requested that my subscription linked to 5309060*** be cancelled. However, I was told that I must pay a cancellation penalty of ₺650, plus taxes and daily usage fees, reaching a total of about ₺2,500 even though I did not actively use the service. They also stated that I do not have the right to withdraw within the legal 14‑day period. Although the modem was switched off, they claimed that 40 GB of data had been consumed, allegedly only from speed tests. Since the service did not meet the conditions that were verbally promised, and my complaints were not effectively resolved, I find the requested cancellation penalty and additional charges unfair and unacceptable. I request the immediate and penalty‑free cancellation of my Superbox subscription, that no debt be created under my name for this subscription, and that all records be updated to reflect that I was not properly informed about the speed limitations of the service.
On January 24, 2025, we applied for the Turkcell 4.5G 350 GB Superbox package. During the application process, we were told that the installation would be completed within a maximum of six days. One day after the application, we received a call, but we were unable to answer at that moment. We immedi...
On April 8th at 21:41, I spoke with a customer service sales representative regarding a Superbox application. During the call, I was informed that I would receive an internet speed of approximately 150-200 Mbps, which is about half of the advertised maximum speed. However, it has now been 6 days, an...
On April 16, 2026, I started a subscription through Turkcell Superbox with the “Superbox 5G Home 1 TB” package. However, on only the 14th day of usage, April 30, 2026, I encountered a data consumption report that is completely inconsistent with normal usage patterns and technical measurements. While...
I have been a long-time corporate subscriber of Turkcell Superbox. I have been using Superbox for 3 years, and for more than 2 years I have been on one of the highest corporate data packages. I pay between $60 and $120 per month, and during this time I consistently received internet speeds averaging...
I have been a Turkcell Superbox subscriber for 30 days, and I honestly don't think there's a worse service in Turkey for the price paid. The unhelpful attitude of the customer service representatives only confirms how poor the service quality is. While they claim that the Superbox delivers the promi...
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