At some point there was the hack that you could switch your subscription to a offer they throw at you when you try to cancel, and then that counted as a new subscription, which you could cancel within the first 14 days. Not sure if that still works.
1: https://github.com/abatsakidis/PDFDeSecure
2: https://www.google.com/search?q=remove%20pdf%20copy%20protec...
3: https://github.com/wilfredwee/wilfred-TILs/blob/master/comma...
If you don't get the "do you want to switch instead of cancelling?" retainer dialog, you may have already declined it. Clearing cookies and local storage did the trick for me in that case.
*where i am at the moment, if i buy something in a shop i have 7 days to return it as i could have 'examined' the item there. Online, delivered, i get 30 days.
Empty shops, retailers, empty shops...I 'remote' purchase. But i do go looking first in your store...