Shop closed in my face before the time while it is my last day to pay for my item

I'm disgusted by the service I got from Cash crusaders in Khayelitsha mall today.Im writing this in with a broken heart.I rushed to the shop today as it is the last day to pay for my phone if not I will lose it only for the door to be closed at my face I explained to the lady that I have to pay today or I'm losing the phone and she said the system is not working but how as there where people still paying in the shop she was liying. I told her if my phone is sold I will deal with her personally. I will never do business with them in my life which means there are making people loss there items deliberately.