New account dissapointment

My new account has been approved. I received a reference number #*** to collect my card. I collected my card and filled in all the documents at the Springs Mall Branch. So my account was approved and I can start shopping. So yesterday I shopped and and the pay point my Ackermans account card declined. A very helpful manager assisted and called accounts, just to find out they need bank statements. So why was my account approved with a credit limit but they still need documents. I stood there embarrassed and my children crying for their clothes. Very upset with the account department!!!