the shop fails to fix my laptop and refused to pay

I bought a Toshiba lap top at hi-fi corporation on the 21 of January 2014 and I returned it to the shop on the 18 of February 2015 as it was no longer working. the manager promised to fix my lap top in 7 to 21 working days. on the 20th of April 2015 I went to check for the lap top Johannes indicated that he had escalated the mater to the head office and waiting for response. only to find out that the matter was escalated while I was talking to them the very same day. I asked Johannes to call his manager and he called Ricado but he could not come. I was told he went to Pick n Pay to buy sausage rolls. I waited for him and he told me to wait for the following day and that he will talk to their head office. on the 23rd I was called telephonically by the hi fi corp and indicating that they have lost my password I have given them. on the 24th april I called Johannes and he told me that I will have to pay for the hard drive because they have lost my password. I was never treated with respect and I demand my money back. please help