Double standards

I buy all my stuff from OK furniture and I've always been very satisfied. Until now. I app**** for a microwave and received an sms to confirm that it was approved. I work full time. So I was afraid I would not catch them open in time to collect. Thus I phoned OK furniture Westonaria on my way there to ask if they would just wait 5 minutes for me to get there. I was told that the manager insist they close at 5pm, because they don't have any men around and cannot wait 5 minutes. I was not going to start an argument over 5 minutes. So I drove like a crazy person arriving in front of the shop at 16h50 only to find that they are closed already. So now my question. You won't sacrifice 5 minutes to go the extra mile for your customer, but it's ok to close early after making it very clear you close doors at 5pm sharp? Now I've been approved for something I cannot get to use. Or are you making me wait another week until I can get to the shop over a weekend. How is this fair!?