debiting double instalment, debiting on wrong day

When i took out a contract i made agreement with Telkom to debit money on the 30th of every month, to my suprise this morning they decucted money and the worse thing double instalment,when i called call centre in the morning i spoke to Jodene she told me there is nothing they can do for me,i asked her to cancel the debot order she even told me she can , is that possible?, she even confirmed that i paid 360 on the 08/12/2015. But there is nothing they can do for me to get my money back, she only thing she told me is to contact my bank, how is my bank going to assist me because is telkom who is suppose to help me refund my money? the worse service i have ever received, if you want to have peace of mind never take a contract phone with telkom. i want my money to be transferred back into my account today , and the debit order must be cancelled becuase they are going into my bank on a wrong date.