Don’t purchase any vehicle from Nissan

We purchased a brand new Nissan NP200 for Nissan NTT in secunda in August 2023. After a few days of purchasing it we realised it’s high fuel consumption and reported it to the dealer. They told us to bring it in and we did but we were told everything seems fine. I told them this is not normal. They told me to create a log book for fueling. I handed in the log book in October and workshop foreman said he would call and he never bothered calling me. I went back to the dealer they told me the foreman is on leave they will tell him to call me but I still didn’t get any call from him. Beginning of February 2024 I decided to call Nissan South Africa to report this issue but till today nothing has been done. I’m stuck with a vehicle that’s high on fuel consumption.