Improper updates of monthly account payments

I have been using Ackermans clothing account since 2013. Paying their installment through EFT since 2014. All of a sudden in December 2015 I started receiving calls that I have not paid my installment.I told them I paid through EFT. It took them one month to update the November and December installment payments which also took my energy and time of always calling them to update my account. It took Three times for me sending them my payment notification hence they will call me the same day telling me I am in breach of contract. They don't bother updating payment statuses but they have energy to call me and tell me that I have not paid the account.<br> <br> In January 23rd 2016 I also paid through the same method I have been using since 2014. I receive and keep on receiving calls telling me that I didn't pay my January installment. I sent them payment notification through [Email Removed] [Email Removed] [Email Removed] and even a fax *** but till now they call me to tell me that I have not paid my January installment. I am getting tired of this. Hear me out South Africa Ackermans will give you problems even when you are loyal to them.