*****ulence debit

Im Nonkululeko Miya, in January 2018 i phoned Standard Bank insurance to cancel my funeral policy because im now a student and wont be able to afford the premiums. Initially my debit date was the 25th when my policy was still active. On the 13th April my sister deposited R600 for me and Standard bank double debited R283, so the amount was R566. When i called to find out they told they were debiting for February and March, how come because i cancelled my policy in January. I feel ****** and these people are *****, why they never contacted me because they have my number?