What would work better for me, as an individual, is to not lock me in, let me try the goods that I have paid for, and evaluate if it satisfies my need, and drive the value (through messaging) of leaving my credit card on your file for future charges.

That would still not be good news, but just a normal expected behavior from a lab testing service.

Again, I am cognizant of the business realities that makes you do this, and just reaffirming why I will not pay for your services.