Wasting my time due to products not in stock

My time was wasted this morning to do a simple sim swap. I visited Vodacom at Standard bank twice this morning in a attempt to do a sim swap. Firstly they needed proof of address and ID. that is understandable but on my second visit to the branch with all the required documents I was told they don't have stock. Really could they not have told me that on my first visit? I was then told I can come back tomorrow? <br> <br> Thank you