YouTube Charged Me During a Free Trial Offer

I received a three-month YouTube Premium discount/membership code through Trendyol. Today, I entered the code in the relevant section on YouTube, but the system did not accept it and showed an error. When the code failed, YouTube redirected me to the one-month free trial offer shown on its own screen.

The offer on the screen clearly said “one-month free trial,” so I trusted that information and continued by entering my card details. However, despite this, my card was charged $3. I was not able to use the three-month code provided by Trendyol, and I also was not actually able to benefit from the free trial offer on YouTube.

The email address linked to my YouTube account is m*******@Gmail.com. I request a refund of the $3 charged to my card and a clear explanation of the issue with the three-month YouTube Premium code provided through Trendyol.