I, for one, have a great deal of respect for Andrew and for what he is doing, although I personally have not yet become one of his customers. (I am a businessman, however …)
If you are for whatever reason now a dissatisfied customer, then I do think that you owe it to Andrew to discuss your concerns privately, with Andrew the Businessman, first. If you have “suggestions,” give those suggestions to him. Even if you now want your money back, that should be between you and him.
It’s simply “not in good form” to use a public forum to “air your dirty-laundry” concerning a businessman and/or the business that you have done with him. Be gracious about it.