Unfair treatment

I'm Mrs Makhema loyal customer of nissan bloemfontein dealership,I'm disappointed about the treatment they gave me,on the 12 September I brought my car to replace new clutch plates that I've paid R180000 after repair I complain that my car still not right bring it back to them twice still said the car is fine.On the 5th of okt took a journey with my family to Qwaqwa ,I've got stucked at Pollorou next Betlelhem, as my Car still on warranty I called Sa Nissan,they responded me by saying their gonna take the car to the nearest dealership which is Betlelhem,really they do come and take the car to Betlelhem. Monday I go to Bfn Ntt nissan told them about my problem that happened over the weekend about the car,only talk to supervisor of mechanical departments about the problem,said to me he is waiting Betlelhem to diagnose my car first ,I ask to put my complain to the manager of of Nissan He refuse to talk to me fine I left.my car stay for 3weeks at Betlelhem when I call they said still waiting for the report,on 29 when I called them to Nissan Sa they said the Mananger of Bfn and Betlelhem said the clutch has burned because I can't my dring is not perfect they are not liable for that clutch. Now my question is this how did they come to that conclusion firstly I'm an old driver that is having more than 20yrs driving secondly I've got 3cars that I bought from nissan why the clutch was not burned,this car that is burned clutch now is 2020 model and I bought in 2020 why the clutch was not burned than if I' can't drive,Management of Betlelhem said I'm not gonna get my car before I pay diagnostics test,these managers take an advantage because I'm a black woman,justdo what ever they want to say about me,don't even considering the money I paid for the clutch that only last for 2weeks,I just want to know the clutch they put in my car does not have a guarantee? R18900 has just gone to the drain on top of that they still want me to pay again the diagnostic test,please good people help about this case I don't have car presently struggling to go to work it's nearly almost a mo th now,thank u from Mrs Makhema