Ah yes, the days of the charge rate changes that never coincided with
your billing cycles.
So when they raised the rate, seemingly on a monthly basis, they would
retroactively split your previous bill, credit you with the cost of the
second part at the old rate, then charge the second part at the new
rate. But it was impossible to match the numbers they came up with,
their charge always appeared higher than what you thought it should be
based on their numbers.
Zen, on the other hand, is still charging me the same rates as it did
when I switched to them in 2011.
--
Davey