Turkcell Changes Billing Cycle and Cancels Promised Free Month

I was previously a Turkcell customer and decided to return to Turkcell again. I called customer service and purchased a contracted mobile plan. The plan I was sold included 30 GB of internet, 3,000 minutes, and 250 SMS. During the call, I was clearly told that this plan also included an additional 5 GB monthly social media package, and that if I chose not to take this 5 GB social media package and instead obtained my SIM card from the nearest Turkcell store, the first month would be covered by Turkcell, meaning the first month would be free. Relying on this information, I declined the social media package and obtained my SIM card from a Turkcell store.

I became a Turkcell customer again on January 31, 2026, received my SIM card on February 2, 2026, and my line was activated on February 4, 2026. In previous periods, my billing cycle had always been on the 22nd of each month. However, after my line was activated, I received a message from Turkcell stating that my billing date had been changed to the 10th of each month. As a result, the campaign sold to me as “the first month is on us” was effectively reduced to only six days, from February 4 to February 10, 2026, instead of a full month.

I contacted customer service again and explained that when I was previously a Turkcell customer, my billing was done after the 20th of each month, but now, after inserting my SIM card, the billing cycle was set just six days later, which reduced the “first month free” campaign from one full month to only six days. I asked whether this was correct. I was told that this was indeed correct and that nothing could be done, and the matter was effectively closed. I absolutely do not accept this approach, the discrepancy between what was promised and what was implemented, or this unfair and misleading sales practice.

My expectation is that, as promised during the sales call, the first month should be counted as a full one-month free period and that my bill should be corrected accordingly. I request that this issue be resolved and that Turkcell ensure other customers are not misled in the same way through incomplete or unclear information.