Can you spot the pattern here?
What are the meter readings now?
...As has been said, we need to see some figures from 'real bills' (based on actual, not estimated, readings) and/or need you to tell us what your meter readings are now...
your old bill shows only estimated usage.
Please provide some recent Actual usage, relating to the period when you feel the cost is excessive.
Tell us how many units you used - rate 1 and rate 2 - over what period on a winter bill.
...how many kWh are you actually using per day (1) cheap rate (2) peak rate?...