The guide
Ask for a refund. No reason needed.
If the guide is not for you, ask for your money back within 30 days of your purchase and you get it. There is nothing to argue about.
Type the email you paid with. That is all we need to find the payment. This is a promise we make on top of your rights under consumer law, not instead of them, and those rights stand whatever this page says.
The full wording is in section 9 of the terms. Anything else: support@bequit.app.