Poor service....first month having a vodacom contract but I have been billed twice...

Am a new customer to vodacom.took a contract at game and I was told I was gona be debited with 24 hrs and it took 10 days for vodacom to debit my Acc and it the debit order returned unpaid...I call call center and was advice to pay r296 including a fee of r100 and I told the lady I wont pay the penalty. Fee bcoz it was not my fault....I paid the r296 got a confirmation DAT my Acc has bin paid...then she told me she escalated my query of not wanting to pay penalty fee will get a coll with 48 hrs of which I did not....just now when I check my statement the have debited my Acc r396...imagine its my first month and already am depressed.... I hate vodacom just the thought am still left with 23 months to pay... Sies poor service.