Very bad manager skills and lack of after sales delivery service

I had bought a lot of parts here for me bakkie. Now i had bought the parts from the sales lady there gave all the info of the bakkie to her and show the bakkie to her as well. She supp**** the parts to me that i required as she knew what parts were for me bakkie. Now its year end as now i can work on me bakkie as i was using the bakkie for work, i started stripping the bakkie to find that the part was not correct. I phone this company many a times to get hold of manager after the 12 try i spoke to someone there not giving me his name. Explained the problem he told me after 7 days they cant help me, i rep**** to saying that its now me fault that the part that the concomitant sales lady supp**** me incorrectly they he didn't rely just put the phone down in me hear. So i think people should know what kind of business this company does.