The Worst Customer Service EVER!

I bought a second hand Mecer touch screen laptop from Cash Crusader Boulders, Midrand for R2,902.90 on the 11th of April which is still under warrantee until 11th of October. The laptop started giving me problems within 3 months with the screen flickering and laptop not charging. I took the laptop in and was told I will have to wait for 21 days until it is fixed but I did not have that time as I need it to work. I had to get another charger which at my desperate time.

Last week on the 15th of September while at work, The laptop started again not charging and seems like it is opening at the back which makes it not flatten as it sits on a surface. Pleaded with the stuff that I need the laptop for work and to please prioritize it since they can't give me my money back. I was assisted by an employee called Tshepo and he promised me that he will do something about it. He booked it in and called me yesterday to collect it. Upon my arrival I was given another charger and the opening at the back still and Tshepo told me that he forgot to mention that part when booking it in. I was not happy with this and decided I want to sell it back to the store. I told the buyer my problems with the laptop that I bought from them and also presented my receipt showing that it is still under warrantee. He told me that the employee who bought the laptop initially got fired. He then asked for advise from his manager called Jane who said that they can't buy the laptop back as they don't buy Mercer laptops anymore and told him to offer me R500 for the laptop.

I fail to understand that I was sold a laptop that the store doesn't take anymore and what does the dismissal of the employee who bought it is my problem. I asked to speak to the Jane the manager a couple of time as the stuff carried on with their other work and left me there as there is nothing they can do for me. They told me that their manager is busy and won't see me. This was very poor treatment I got from stuff and the manager who refused to see me. I left the store as they were about to close and no one was attending to me.

In the mist of all of this, I have lost time at work having to take in the laptop and no one cared about this. Why was I sold a laptop that the shop won't ever buy and why am I offered R500 for a laptop that I bought for R2,905 which is still under warrantee? I feel so disrespected and mistreated by Cash Crusaders in Boulders, Midrand! What kind of customer service is this?