Party-Rentals in Pretoria - not supplying working equipment

I contacted Party Rentals in Pretoria for a quote to hire a jukebox for my daughter's 21st party on Saturday, 8 September. On 22 August I booked a jukebox, 2 x disco lights, 1 x light burst, 1 x PA system for 8 September and on 30 August I made payment to them in full - R2100. On the day of the party (8 September) I contacted Lezanne to confirm what time they will do the delivery. She said she will get back to me. The next moment I receive a whatsapp message from her stating they will delivery the next day at 11am (which will be on the Sunday). I phoned her back and said to her the party is today not tomorrow, so she said that I made a booking for 8 Sept, so I confirmed to her that it is 8 Sept. She then advised that she will chat to the driver and she confirmed that they will deliver at 3pm. The driver only arrived at the venue around 4.10pm. When they unloaded everything I noted that there is only 1 disco light and when they connected the jukebox it was not working. The driver phoned Lezanne about the disco light and the jukebox not working and I also spoke to her. She said that the driver has to go back to Pretoria to fetch another jukebox and the disco light. They left the hall around 4.40pm. At around 6.30pm I phoned Lezanne to advise her that the PA system is not working. She asked if they left us a charger for it which I confirmed that they did not. She said they were supposed to leave a charger with me. She said that the driver is on his way with another jukebox and PA system. The driver only arrived back around 7.20pm without the other disco light. He said that Lezanne made a mistake and hired out the other disco light. He changed something in the back of the jukebox and it then worked but he (Louis) advised us that the new PA system is not charged, so we must first charge it before we can use it. We charged the PA system the whole time and when we wanted to use it at around 10:30pm it still did not want to work. I contacted Lezanne about this on Monday morning (10 September) when she informed me that there was a mistake from their side, that they received a cancellation from another Liza and they just assumed it was me - without contacting me to confirm. They were not prepared for any delivery on the Saturday as they thought I had cancelled and when I contacted them they panicked and quickly organized a delivery for me. I am very upset with the unprofessional set up by not confirming with the client about any cancellations. My daughter was in a state at her party because there was no entertainment. What should have been a great time was a disaster. I phoned Lezanne to advise her that I want a refund of the disco light (R150), PA system (R350) and R500 of the hiring fee as we had to wait for them to fix the jukebox and also for the inconvenience. They did offer me R150 back for the disco light and 15% off any equipment which I want to hire from them at another stage. I advised Lezanne that I am not interested in any discount as I will not be hiring anything from them again in the future. I expect a refund of R1000 for their mess up and the inconvenience it caused us. I have not heard anything back from them.