Apple iStore Menlyn worst cutomer service at technical support

So I went to Apple iStore Menlyn last night, to get my MacBook, which was an instore purchase at Menlyn branch specifically in 2011, rebooted and set to default factory settings. I booked a session at 18:00, only to be told firstly that my MacBook is "ancient" and that it was not an instore purchase so they will ask my R250 to reset it back to default settings as they can't find me on the system. I then told them that it was in instore purchase and they started with a new story that they got a new server and that their entire database before that certain date was deleted and the only way they will help me is if I bring them my slip or proof of payment - from 7 YEARS AGO!!!! They made their problem of not backing up their clients details (and it is not as if they don't OWN the Cloud for backup!!) mine and then expects me to pay for a service because they through away their clients details.

Having the audacity to tell me it is company policy that they can't help me if I didn't keep my slip after 7 years. Cherry on top, they started to ignore me as I am trying to have a conversation with them about this situation, keeps on insulting my laptop by saying it is ancient and then just started to walk away while I was standing there talking to them.

So message to Apple iStore Menlyn: You can be sure to hear from me again, I will not let this go and you will help me at no charge because it is not my problem that you didn't back up you data. I will not pay for mistakes that you made! Indeed the worst client service I have ever received, you really don't give a damn about your customers.

I will be waiting on a reply.