I have the same problem. I purchased CleanUp a few months after Avast Premium. It immediately deleted 9.8GB of downloaded files (on a brand new computer), without warning. This seems to be a common problem, yet Avast still issues CleanUp without any warning to reset downloaded files to "ignore" (or, better, stopping it deleting them to start with.
So I decided to let such an untrustworthy program lapse.
However, instead of renewing Premium, Avast sold me a compulsory package including CleanUp, which still had a few months to run.
Because I am locked out of my PayPal account (I have no mobile phone, which is needed to log in), and thus could not update my credit card details, and Avast would not let me pay directly by credit card, I sought help from you.
However, when the subscription actually became due, I was offered a credit card option, which worked successfully, and was accepted on 4 June 2022.
But PayPal had meanwhile updated my credit card's expiry date without informing me. So your system renewed the original CleanUp when it expired, although you had already sold another copy to me in the Ultimate package.
So I have paid for the same program twice.
Your contact complaint form offers the option of accidentally making a duplicate purchase (whereas this was compulsory). I tried it several times. You threw my form away every time. A popup would say "start chat", but didn't lead anywhere, and I would just gaze at a blank blue screen.
I found an email address for Avast's headquarters online, and wrote to them, but they didn't reply.
How can I block Avast from automatically renewing my subscriptions. please? It may suit you to charge me twice for a substandard product, with no means of redress, but I don't see why I should.