But by your logic, if you had signed up for a monthly subscription April 3, your next billing would have been May 1. Then you couldn’t have said, “it would have cost $500 in the first month.” It is disingenuous to say it cost $500 the first month. It cost $255 for each four-week period.
So you are arguing three days. You argument is that Rosa Labs should define a month as 28/30/31 days, vs. 28 days.
Surely you can at least recognize the other side? Surely you can see, even if you disagree, that it is not unreasonable, as @horsfield points out. That Rosa Labs took an acceptable manufacturing standard.
I’m sorry it was hard to talk your wife into a subscription spending $255 a month. But does she really draw the line between spending $255 a month and spending $255 every 28 days? That is the equivalent of her agreeing to you buying Soylent every February, but not any of the 11 other months.
Again, you are now disingenuously claiming it cost you $500 for a month. It cost you $510 for eight weeks.