I bought it based on the promise of improvements.

Only 100 SMS/mo is very little. Consider making this quota higher. For a different kind of service, Feedier is offering 500 SMS/mo in their current lifetime deal.

There are 3 huge Bookafy advertisements in every confirmation email or reminders they send to my clients:
A big button “Get Started for Free” (this is the biggest issue);
A “Powered by Bookafy” statement;
And a hyperlink: “Copyright 2018 bookafy.com”
This kind of big advertisement usually happens when we are using a free service and, even so, many times it is not this intrusive. But we are not using Bookafy for free, we are paying for a subscription. White label is very desired here, otherwise it won’t look professional at all. I could live with a small branding (for instance just “Powered by Bookafy” would already help them to gain visibility) but I definitely don’t want to be sending huge Bookafy adds every time to my clients. They will actually think that I am asking them to sign up for this free service and it is not what my business is about.

If these can be fixed (among other small things I point to their support) I would be glad to keep the deal. Otherwise I'd be obligated to hit the Refund button for the first time. I really hope it won’t be necessary.