Very very bad service

From day 1 when I got my Ford Ranger I had problems with it the first time when I drove it to work the water pipe burt so I fix it then n week later the fanbeld came of and damage the hole front of the engen and they fix it also putting in a secondhand timing cover because they did not have one in stock and then it did not want to start dew to a foulty altenator that broke the battry and i also bought a new battry now the head gascet went and they fix it after a R13000 bill after one day the engen startet to run uneven I took it back and they stip it again and fond that the rockerbox broke and aperently you cant bay it sepertly now they want to put in a secondhand one inso after alot of problems with this bakkie i am fed up with it l I went back to the sales person a lot of time an told him I want to bring back this bakkie then he told me it will not happen so now I am sitting with a bakkie that is costig me thousans of rands and the warenty only covers a few of the cost So I want this contract been termenated or they must put in a new engen in