MiWay

I have noticed that Miway is starting a bad trend of debiting clients accounts as they want. First they debited my account before the agreed date. Now they are debiting my two bank accounts for the same premium at the same time (they have my other account because I changed bank details but the old account stayed on their system). Now I'm receiving sms for no payments but premium was collected on my main bank account and they say it's system error?????? Is there no law that protects clients for companies that access bank accounts with no permission from the owner (they had no permission to access my secondary account) ???