Vodacom Debits account without any delivery that took place

Vodacom , I am extremely upset with you trying to debit my account twice after I cancelled my sim card order delivery due to non delivery. I app**** online for a sim card delivery, next day without prior arrangement of sms the driver pitches with no one at home. I rushed home (5min away) only to get "NO One" was there. This happened another 3 times. I then phoned Vodacom to cancel this delivery. They tried to debit my account twice. I feel this is unacceptable to debit ones account without any confirmation of delivery.