Experience with Laptop Mechanic

Good day, so I found laptop mechanic (laptopmechanic.co.za) doing a search. Requested a quote for a CPU fan for my HP Notebook, gave full description of my laptop. Afterwards got a quote from them. I then opened my laptop to send a photo of the fan, including the serial number of the fan, and then included even more detail on my laptop, and asked them to double check so they can be sure that it is correct part for shipping. They responded to me saying that the fan/part will work 100% for my laptop. Meaning they guaranteed me that they have the correct part. So I payed them and I got my item the following day. I notified them that I got my part and when we wanted to install the part it was the wrong part. I immediately notified them, and they responded and said they will sort this out. They got back to me saying I am welcome to send it back to them for exchange. And here is where my problem is... I would have to pay the courier for a second time, they guaranteed me that the part will work on my laptop 100% and expected me to pay the courier again for THEIR MISTAKE! I have had similar issues in the past with different online shops, and whenever they sent a wrong item or anything of that sort, they compensated by paying the courier services themselves. So to get back to my review, I refused to pay again for the courier and asked them do they really expect me to pay for their mistake? So the way they responded was by ignoring me. Reading my mails/WhatsApps but no response. So at the end of the day I had to drive all the way to their address in person, and exchanged for the correct item without even getting an apology from them(even though it was their mistake) so I warn anybody to make sure you stay close to them and best try to avoid courier service, otherwise you will have to pay double courier service if they send you a wrong item. And they will most likely from there avoid any further communication with you. My conclusion is very poor service.