Turkcell Superonline Disconnects My Home Internet Repeatedly

I am not satisfied with the Turkcell Superonline home internet service. I have been experiencing frequent disconnections with my internet for a long time. All devices in our home have trouble connecting to the internet. My spouse has contacted customer service multiple times regarding this issue, and although they offered a few potential solutions, our problem has not been fully resolved. This situation has also increased tension in our household. Most recently, during an online exam my daughter was taking, we were unable to submit her answers on time due to a disconnection. As a result, her exam was not accepted for evaluation. On May 19, 2025, at around 20:05, I called customer service and explained our complaint. When I checked the system, they told me there was currently no connection issue visible. I was informed that there had been a disconnection previously, but now they couldn’t open a fault report. When I asked what we could do since the problem still wasn't resolved, I was told they could send a technician for a fee or that I could purchase a new modem, again for an additional cost. I find this situation completely unethical. I don’t think it is right for us to be charged for an issue that stems from their own inability to provide proper service. I demand that this issue be resolved as soon as possible.