Bad Costumer Service

This month I went to Pick 'n Pay (Eyethu Mall) in Orange Farm EXT 2. I wanted to pay my account for my laptop. It was my final day to pay, the lines were long since it was the beginning of the month. I waited and waited... finally I arrived at the cashier. When I arrived the cashier told me she can not help me pay for the account since the account number (Easy pay no.) Is written in a paper. I asked her "why don't U guys allow that?". She asked for a supervisor 'Cause she also didn't know. The supervisor told me it's because the number isn't clear. The number is clear I even showed her. She then called another supervisor named Yondiswa. The supervisor told me it's because they only allow account numbers written from an email or sms. When I asked why she basically said that's how Pick 'n Pay is. I fail to recognise the difference between a number from the slip with the number written from a paper. I then went to Shoprite and they allowed me to pay... I think this is bad customer service as they don't have valid reasons for their policies. I was more furious 'Cause it was the last day to pay, if I didn't I would have lost my laptop to the DEPT COLLECTOR company. I word at Edgars and I have never even once failed to provide an understandable reason for our dos and don'ts.