Change of payment arrangements without notice

After having my account approved by The Hub Riverside Nelspruit in early Dec 2015, I signed the Nedbank-Hub agreement for total amount approved, repayment period & date of first payment due - 25 Jan 2016. I signed the agreement for the sake of having a fixed arrangement for payments, and they have these dates on the agreement for a reason - to make sure that the customer is aware of when their payments are due. I then visited The Hub again in mid Jan 2016 only to be told that I had been sent a statement by post with an amount due by 02 Jan 2016. 1 - I had requested for statements to be sent by EMAIL. 2 - The date of first payment as per the binding agreement was set for 25 Jan 2016. Why was this changed without my approval or my being notified? I contacted Financial Services & requested for the outstanding amount which they confirmed was R18.80 - I paid this and waited the 2 full working days for my card to be unblocked. I revisited the Hub today 27 Jan 2016 and once again I'm told that there is another overdue amount and the card is blocked again. I have paid the additional amount but this is absolutely ridiculous and pathetic service. Be wary of shopping at The \***********"Hub"""