Problem not fixed after 6 weeks

My one vehicle was put on their system as a 2014 instead of 2015.They stopped paying cashback in Sept as they wanted a T&T check .I called them to say the vehicle is only one year old on 24/12/2015 but I anyway did a T&T check for them and sent it through for future records. After 6 weeks they keep telling me it is an IT problem and that it still has not been fixed therefore that vehicle does not warrant cash back. What is so hard for them to sort it out probably a 5 minute adjustment in the system but no they even call me to say they are fixing it but today tell me nope still not fixed. unacceptable. Where is the sense of looking after the client. They have no clue how to fix it and cannot be bothered anyway so what is the point of cashback when you don't get it anyway. Looking at moving companies definately.