Sounds like you didnt sign a contract with an electricity provider and therefore are put in a fallback ("Grundversorgung") contract with the grid provider, which in 95% of cases is a bad deal for normal consumers. You are free to make this choice, but if it bothers you enough to complain about it, it should bother you enough to invest 30 minutes and sign a contract: https://www.verivox.de/stromvergleich/