Bad service

This morning 31.01.2021 I went to pic n pay expess Tshepisong to buy some refreshments on my way out im being stopped by security say i cnt go out because apparently i picked up a R100 note on the floor, so they need to check the footage, i then asked the security where are they checking the camera footages he showed wen i got there to my suprise the is no 1 in that room n yet i was told to wait at the door, so if i ddnt ask where are they checking thr footage i was gona wait for ever cos der was no 1 checking anyways..... So i just left. I just want to know is this the service they give to all their customers treating them like *********, the manner of approach was not profesional at all n they didn't even bother to appologize. I also want to know even if i did pick up that 100 does it belong to the staff cos ik sure it wud be from one of the customers. I mean when i passed there they was 4 staff members chatting why ddnt they see that 100