Cancellation of insurance

Call agent called to offer funeral and accident plan however I advised and said that I am not comfortable taking up this plan as I need to discuss with my daughter . agent then said it's fine and I can cancel it if I don't need it and I'll be receiving a booklet with all details which to date I have not received . went twice to cancel this and nothing has been done . Now I have debt behind my name due to premiums due . I cannot purchase anything unless this payment is done . Please can this be cleared. Very unprofessional behaviour from well know retail company which to date cannot even cancel this plan which I never agreed to.