My Arçelik 6167I Dishwasher Fails to Dry Properly

I bought an Arçelik 6167I series dishwasher, and it doesn't dry properly. Every three washes, it gives a salt warning, and I have to add 2.5 kg of salt continuously. Additionally, the automatic door opening feature activates between 5 to 20 minutes before the cycle ends. Although the display panel shows a Wi-Fi symbol, we can't use the Wi-Fi feature because the machine wasn't registered in the system.

We called for service due to the drying issue, and they said there was no problem and to add more rinse aid. A dishwasher's rinse aid shouldn't run out in three washes. When I called to request a return, they said a service technician would come, and if they deemed it appropriate, the return would be accepted. If my return request is not accepted, I will take this matter to the Consumer Rights Board.