They don't inform customers properly

Well me being a vodacom contract customer since 2007 I now have an issue. I am meant to upgrade on 28 August 2015, so i phone in to request the phone i want, then i got told that since i pay my account via EFT (which i have been doing for about +- 4 years) that I am a risk and that they are not sure that I can get the phone I want unless I switch to debit order, I can understand that, if i was someone who pays late or skip a payment etc... but I am not, in fact I am so disgusted that I think I should get another service provider and I would not recommend any of my friends or family to make use of Vodacom as the service and information is pathetic, and they can not resolve my problem. My question is why give your clients the option to pay via EFT if it's going to count against you when you have to upgrade. Very disappointing!!!