My final statement is wrong — how do I dispute it?

A final statement (after contract end or switch) must be based on measured meter readings or readings you supplied. Common errors:

1. estimated readings while a smart meter exists,
2. wrong tariff calculation (old tariff applied to new-tariff period),
3. unaccounted feed-in credit,
4. duplicated grid fees. What to dopay the undisputed portion; dispute the rest in writing within 30 days, announcing a GCE complaint. Under standard energy contract terms the supplier may NOT start collection during an active dispute. Keep all evidence (old invoices, meter photos, switch confirmation).