Turkish Airlines App Errors Prevent Me from Redeeming Expiring Miles

Turkish Airlines notified me that my miles were about to expire, so I tried to convert them into gift vouchers using their app. However, the system repeatedly displayed an error, making it impossible to complete the transaction. Is this deliberate, so customers can't use their miles?

When I called customer service, the representative, who said their name was A*****, simply responded, "There’s nothing we can do." This is unacceptable from a company as large as Turkish Airlines. Why are loyal customers treated this way? I will be filing a complaint with the Consumer Arbitration Committee if this issue is not resolved immediately. This behavior is unfair and causes unnecessary frustration for customers.