Tata Motors — speeds mettre and mileage issues

06/2019 i service my 10wheel tanker truk for millage issue at madhavaram papular motors they told noting we clear all those problem but today onwards the problem is still live i change service centre also no one can't clear that millage issue and also i change speeda metres also then finally it's not mileage issue that's your speeda metre problem last year i purchase total 5 number of vehicle all are 2018 model vehicle last one year i change many crew in my company but it's not crew problem it's your company problem if you take further action to clear the problem the problem vehicle number tn 18ar 1899 kindly take the issue tomorrow i send the vehicle to madhavaram service centre and also contact my number [protected] language tamil