from what i understand, they don't read your meter every quarter - they dn't HAVE to read it every quarter - i think it's biannually that they HAVE to read it. if they underestimate for one quarter, when they DO read it, you end up with a huge bill to make up for what was missed.

you pay to have someone come and read your meter - if it's accurate, it's on your head as you've requested someone come out and provide a service that isn't required. if it's not right, you can argue your case to have it credited etc.