Unprofessional and ***********

I signed a contract with Blue security in March 2022. They did debit my account for like 4 months and then they phoned me to tell me that I owe them four months. I refused to pay because it was an error from their side. They agreed to credit my account with the arrears. But they still insisted that I pay the previous month, I still refused. They then started debating my account. The installment was more than what we agreed on. In October the debited me twice in one month. When I queried it. They told me there is a month I didn't pay for, which was a lie. I canceled the contract since they are the ones who bridged the contract. Their systems are so ***********. They told me I need to pay 30% penalty fee of the remaining balance of the contract. How dare they demand me to pay after all the pain and mess they made me go through. They are a ****. Very unprofessional and ***********. They still debited my account after canceling the contract. I am definitely going to log a complaint with ombudsman.