Ford intentionally has wrong information about me on their system and they dont want to fix it , it has been two years since i requested them to rectify however they dont want

i dont know what to do anymore with company Ford i purchased my ford fiesta on 17 October 2014, but on their system it says i purchased the car in may 2014 and this have always affected the warranty whenever i had problem with the car, during the last incidents i had i paid 25% from my pocket and they paid 75% cause they penalise me for servicing car late for 1st service since i ddnt knw that the system was saying i bought car in may 2014. 1st incident ford the glen paid back the money i paid after admitting they made a mistake when capturing information and instead of october 2014 they mistakenly type may 2014 .second incident that happened late last year ford south africa paid me back via ford gezina delearship however they still dont want to change wrong information on their system. they admitted the mistake but they just dont want to rectify the mistake they made , i requested them to change this information since 2016 but they dont want to help me.