I understand that it was my fault completely that I should have used their app for the trial version first before signing up, but having to penalize a client for 12 months and enforce their obligation, because of a 1 day use is in my opinion not a way to treat a customer.
In my opinion, what seemed fair and also as I requested them, was to charge me for a full month of May for not checking out the software first.
Buyer beware!