Bad service

I went to buy a selfie stick at Edgas connect at tsakane mall when I got there they said their system is slow and I didn't mind that. Then the manager came and the lady that was helping me told him that they still having slow connection.the manager said they must take the money and give me the stick. I then asked the manager that don't I get a receipt or anything just so I can have proof if the product gives me a problem he says no. I told him that but both parties need proof he says no I don't need it.I said ok then I asked him to help me on how to use the stick he told me that I must sit down and read the instructions from behind the box. In which I explained to the cashier earlier on that I cannot see without my glasses earlier on. the manager left and then when the lady and the security there saw that im struggling with using the selfie stick they then assisted me with no problem.. the manager there does not know how to treat people.