THEY Dont want to refund me

i was robed by auto pedigree sales person ,and I reported the matter to auto pedigree mokopane they appointed an investigator Johan who never gave me the results of his investigation. sales person robed me by asking for R4250 during the delivery of vehicle later when I ask him for receipt send be email he started to tell stories ,I the requested the vehicle invoice only to find out there was never such payment,i then reported to regional later after few days I was told they cannot help since the guy handed resignation letter . I need my money from auto pedigree...I provided the investigator with prove of voice calls together with my bank statement and avidavity still no help.