My car was mixing water and oil and they suggested that they will sell me a second hand engine ,that was February 2017 and they charged me R23 000 for that. My car is dead now withthe engine problem and they told me I should buy another engine

They installed a second hand engine in my nissan Qashqai in February 2017 and now my car is dead with engine problem and I was told to to pop up R36 000 for another second hand engine or pop up R18 000 they will fix their second hand engine thst could not finish 6 month and I was told that the guarantee was only for 1 month. I am really upset with their service ,my car is dead now where will I get R18 000 in less tha six months.That is Ram suspension kempton park