So not where to start.

So not where to start.
Since a certain my mother sees appearing on his account a levy of SPVIE ASSURANCE, for a legal assistant to which my mother would have been saying "be said subscribes" except she did not sign a contract and at no time did she communicate her bank details or even signed a debit authorization.
So my question is ... How to cancel this contract and especially how to be reimbursed for sums withdrawals without his consent.