Bill amount R27 336,75 on a contract supposed to be R1799.00 HOW IS THIS POSSIBLE

How do you explain this? I have upgraded an existing contract on my husband's name to a new My Gig20 MBB 24Mnt TOPUP contract with 20gig data a month on a TOPUP basis. I can not make this more clearer that it is a TOPUP contract, the day I upgraded the contract I asked the person that helped me 10 times, this is a TOPUP contract right? It can't go over the 20Gig data a month unless I TOPUP the data right? Yes mam that is correct. So here the debit order for this contract goes off, R27 336,75!!!!! The contract costs R1799 a month.

So the bill states, the contract costs R438,26 and data usage is R23332,83. VAT R3565,66. So in store Vodacom says it is what it is??

NEVER IN MY LIFE WILL I ADVISE OR USE VODACOM AGAIN. Look at all the bad comments on vodacom from other people, it is terrible.