Vodacom is ****

I went to a Vodacom shop in Vosloorus on Monday to enquire about a sim only contract and my ID showed an account for a previous deal i rejected from Vodacom. we called the accounts department and they said they will remove the account as it doe not exist. i was supposed to go back after an hour for the contract but because the rain was getting worse i left. last nigth a debit order of R46 goes off my bank account with ref no.***. How? i did not sign any document with the consultant at the shop? i never even chose a product or give her my proof of address or payslip. i am a loyal client of Vodacom but the **** ups are making me doubt Vodacom, i want someone to call me and explain this as this is affecting my credit score.***