Oakhurst insurance unapproved policy

My mother is having some unapproved debit orders from Oakhurst insurance. She has never received any document of the policy they debit from her bank account. We made a stop payment with the bank in March. They call her and she told them to speak to me. I told them that my mother doesn't afford their policy as she has enough policy. They are now making debit in her account again. All we need is some advice on holding them accountable cause I told them that they must cancel the policy and stop calling my mother or giving her details to anyone. I will appreciate your help on this matter.