To avoid getting charged that way, cancel your Daz+ account. It will run until its expiration date and you won't get charged when it expires. After you cancel, buttons will appear in the membership management page of Daz account for Auto Renew on Daz+ with expiration date shown and Choose Plan for Premier. Choosing that plan with time remaining on your Daz+ kills that time remaining. So, maybe don't press anything until everything has expired.

There are/were some personalized offers for converting Daz+ time into x months of Premier, but that seemed like a really bad deal. I passed on it.

I've been thinking, at some time in the future, for specific sales and promos, I might pay the membership for one month of something and then cancel it a few days later. The membership would last for that one month period and expire. I'd pick my times carefully. Could maybe get over that way. Or maybe I'm just done with all that. Not sure yet. For now, I still have residual Daz+ time. Not sure it matters.

I'm put off by all this, so I'm not in any hurry to buy anything from Daz now. So much for this year's Daz+ sale. What a mess!