Spaar On Spares (Regents Park) (Pty) Ltd - Johannesburg

Its SO unfair....
I did nothing wrong....
Besides being out of pocket, Im lost for words...
I order a part....
I drive all the way from Germiston to collect the part...
I pay my mechanic lots of money to fit the part supplied by Spar on spares.... to find its an crappy inferior part that will never work...
I pay the mechanic lost of money to put the old part back...
I drive all the way from Germiston back to Spaar-on-spares to return the inferior part back...
I was issued with a credit slip, and was assured that I would get a better and correct part.
I drive all the way from Germiston back to Spaar in spares to collect the correct part..... to be told that I will not get a refund, nor the correct part on the basis that my mechanic fitted the part that was originally supplied...
I did nothing wrong....
The worst service I have EVER encountered.....