First, I’m an Avast user and not an Avast Team member.
You say you have never had the Free Trial nor wanted the Free Trial, which begs the question.
How could they get your bank/payment details to rob you ?
If you did ever want to use the Free Trial a prerequisite would be your having to set up a payment mandate.
There are some scams doing the rounds, I had one where it said a charge for an AV I don’t have and a sum much greater than would be normal. This has a telephone number, unlikely to be legit, all to gather more information and hopefully bank details to refund to really trigger an actual charge at your bank, etc.
I had never used the AV in question and the sum was massive, all to trigger a response.