Mislead by energy company?

As a result of being misled by an energy company, my energy account was switched on 3rd of March 2023 and I signed it off the contract on 8th of March as I realized that the amount of the invoice was higher than what was communicated.
I blocked them on my bank account not them let withdraw money.
They keep sending me emails and letters to pay almost 352 EUR for 5 days only, but then in the latest letter that they posted to my address, they ask me to pay 145 EUR.
If you search them, you would see that they had to pay 400.000 EUR of penalty as they misled the people in this way many times.
I'm convinced to pay the bills that cover 3rd of 8th march, which is 16 EUR. But i also would like to hear your legal advise.