Ebucks updates incorrectly to give u less

I have been receiving double Ebucks for the last couple of months since FnB indicated u had to add your car on the navcar and spend exclusively at engen. So that is the behaviour I have been following. Now I see my car randomly disappeared from the app. And also it says I spent R300 at an other garage which I most certainly did not. They claim this was for nov an dec and so the whole quarter is messed up even tho I banked exactly like they wanted me to. Even doing the scan to pay at engen since December