TAKE MY DETAILS OFF YOUR DATA BASE

I HAVE CANCELLED A POLICY IN JULY 2015. SINCE THEN, I STILL GET AN SMS EVERY SINGLE MONTH ON THE 1ST DAY OF THE NEW MONTH OR THE FIRST WORKING DAY OF THE NEW MONTH SAYING YOUR ONEPLAN DEBIT ORDER HAS BEEN RETURNED..... I DONT WANT ANYTHING TO DO WITH ONEPLAN!!! I HAVE PERSONALLY SPOKEN TO SHANICE MAISTRY TO REP**** TO MY FIRST COMPLAINT BUT I AM STILL GETTING MESSAGES SAYING DEBIT ORDER RETURNED!!!! TAKE MY DETAILS OFF YOUR LIST AND LEAVE MY ALONE!!! HOW MANY TIMES DOES ONE HAVE TO COMPLAIN FOR ONEPLAN TO LISTEN???