Threatens to take double installment this month

After being called more than twice, Makro threatens me to double deduct my account this month. Firstly, they (Makro) send me a sms in Des that no debitorder will go off because I qualified for the Payment Holiday. Now in Jan they are calling me telling me that that was only if I bought something then I actually qualified. NOW that information was not disclosed in the sms AND there were no indication that I need to comply with the T&C's on the sms. Now Makro wants to make a double deduction on my account in Jan, what I will not be able to afford. This is not acceptable and I am sure I am not the only one this happened.