poor customer service

I app**** for the vodacom contract phone at game clearwater mall and on the 3rd November 2015 I went to collect it. In the forms that I completed I indicated that the derbid order should go through on the 1st of every month. On 11th November 2015 I received a notification from my bank that vodacom has debited but the funds were not sufficient, I called vodacom and they told me that the store which was asisting me was supposed to have informed me that the first debit will be sent within 24hours after the contract was active. I am not pleased with the service I have received at Clearwater mall because they never disclosed this important information to me, should I have know in time I would have ensured that I fund my bank account. Now I have to pay for an extra R100 to vodacom because the derbit order bounced and I still have to pay extra charges to my bank for the same derbit order that has bounced. On the other hand my credit record is being messed up with.