Parts not replaced as per quotation.

They did not fix my car and the work took 2 weeks not 2 days as per quotation.<br> I phoned customer care and they referred me to another dealer.<br> They informed me that the part was not replaced by Silverton and that they cant replace it without purchase order.<br> Now they insist on me taking the car back to the same people that did ********** work in the first place.<br> How can I trust them after lies, bad service and *****?<br> I have been without the use of my car for more than 7 weeks.