Possible problem with debit orders

Good afternoon<br> <br> I have contacted Momentum on the 19th of November about my debit order of R311.40 as I have joined Multiply and should receive 15% discount. Which is still the full amount and NOT the discount.<br> <br> My debit order went of again yesterday as I contacted Momentum via email, to which they responded with the same answer, that I am receiving a 15%, which I'm not receiving. I can attach bank statements as proof.<br> <br> A few minutes ago another debit order of R320,49 just went out of my account to Momentum.<br> <br> Totally unacceptable!!! What is the reason for this???