If you're discussing with a B2B company about buying service for a business idea you want to bootstrap the first question that will be asked is: Why do you think you should be considered a 'consumer'?
About all I can suggest, if the time frame is short, it's possible there are existing regulations regarding purchases where it wasn't entirely that clear, and it's worthwhile to check.
However there is a slight suggestion that the time frame is considerable, and it's been reserved and slotted for use in a given period of time.
Consumer protection laws do not apply to businesses and individuals acting for business purposes. For instanced, in the link you shared previously it is written that the 'Cooling-off Rule' does not apply to "sales that are for goods or services not mainly for personal, family, or household use."
I really could not say one way or another based on the limited amount of information, nor do I feel like being tasked to track down any relevant regulations (additional to not as described or cooling off considerations) that might apply in a given country. Besides, as stated, I feel there is a slight suggestion the time frame is considerable.
Rules and regulations are not necessarily the same everywhere. It's a mistake I've even seen a couple of multi international companies commit operating in Australia. Personally I've seen a large US based bank kiss goodbye to a large chunk of business after it was brought to their attention one of their operating tactics was actually illegal, one year they had a large presence, on the ground branches up and down the coast, the next, not even a contact number for the entire state. The thought they got away with this sort of scumbag BS in the US still makes me shudder.
However it sounds like you've other services with them you have already paid for, and thus it's less likely a company would pursue an individual for monies owed but rather discontinue all services they have. Their path of convoluted or hidden / unclear fees is certainly an unwelcome surprise.
Usually services are provided only after the customer has paid. Those that don't are either incredibly generous and trusting ... or absolutely precious. In regard to precious, in my rule book for all business and personal purchases, they are deserving a close and critical eye with an expectation of a poor and bad outcome to surface, and being prepared with a contingency plan having already shopped around without being in a panic, should the moment arise. I think it's fair to say some smaller and newer companies providing services have tight spots as well, and generally resolve as the company grows.