Bad Customer Service

I am the Founder and CEO of 4Souls Foundation a Non-Profit Organisation established to address sustainable educational needs of under privileged children. I went to buy uniforms for our children yesterday at the PEP Stores in Diepkloof Square, a store that the foundation has always bought big quanties in. I arrived there at 17:35 and the security guard from CCJ Securities had already closed the door. I asked him why the store was closed as it was not 18h00 yet and he told me it is packed inside, I then asked to speak to the manager and the security guard was very rude and shutting the door at me he even hurt my ankle. The other staff member "Ntombi" came screaming at us an telling us to go away because the store is closed and they want to knock off at 18h00. We watched as customers were going out and the store was becoming emptier. The manager never came to the door to address us as customers nor explain why. I advised I would call the Head Office and I was told that I should go ahead. I have spend our funding supporting PEP Stores over the years and have decided to buy from another store going forward. I refuse to be treated like that at ANY store more especially one we support so much. The service there is terrible and your staff members don't know customer service nor how to address us. I need urgent feedback on this matter as our children went to school without uniforms today due to incompetence and rudeness. The fact that the store is in Soweto should NOT give staff members the impression to treat us like they doing us a favor.