Confusion Over Credit Usage Reset on Monthly Billing Cycle

ALERT, ALERT, ALERT!!!! I am not sure that everyone knows about this but I recently inquired about why my usage is not starting from 0 on a 30 day billing cycle or monthly cycle. This is the response I received ": "The credits don't reset to 0, the credits fall off every day based on past usage 30 days ago. So if you used 1000 credits 30 days ago, your credit usage would go down 1000 credits today." 💥🤯 The way I interpret this makes no sense. Nowhere is this documented that usage will roll over from a prior cycle as long as it is within a 30 day period because usage is on a rolling 30 day period, not a billing cycle. That's like using your credit card for $4000 one month out of a $5000 limit, you pay the entire balance before the statement closing date, let's say May 28th, and the statement closes on May 30th, but because you had a large purchase of $2000 within 2 weeks prior to the statement closing date, come June 1st of your new billing cycle you only have $3000 to spend until the $2000 transaction 'falls off' after 30 days . That is totally ridiculous! Since my credit replenishment is on a 30 day cycle, why wouldn't my usage be on a 30-day cycle as well? Unused credits don't roll over, so why does usage roll over? 😡 If that is the case then unused credits should also be rolled over. Maybe nobody else feels the same but this sounds like a rip-off to me so I'm bringing it to everyone's attention.