Multiple debit orders going off my bank accounts

As a new contract customer I took out a contract last week, received my order on Monday and already have multiple debit orders going off my account which no one informed me of and this was not told when I took out the contract..I have been a prepaid customer for many years and have been happy with Vodacom but I so angry of the debit orders going off my account..please explain otherwise I will return the devices with their simcards