Sanlam failed to debit account on 2nd and on 10th March

Paychec was payed in my account on the 2nd March, sanlam tried to debit on the 1st of March, arrangements was made to debit my account on the 10th but still no luck, no idea why on the 10th, now getting sms i have lost my benefits, how can this be fixed now?tried calling but running out of airtime after 19min of holding the line, please fix