Suzuki Baleno driving problem

I have bought a new Suzuki Baleno for my wife two two months ago at BB Suzuki in Hatfield Pretoria. We drove it slowly until 1 000km to keep the revs below 4 000 rpm so as to properly run it in. We at first notice a sort of dead spot after changing gears, which become more noticeable when we drove it a bit more eagerly after 1 000 km, especially between first and second gear. We took it in to BB Suzuki beginning December 2022 - they insisted that the diagnostics revealed nothing and claimed they could not compare it to other Balenos as none had came in for services as yet given the fact that the specific model was relevant new in SA. They suggested it be a Suzuki SA problem but to date no-one has made any further contact. Not sure if other drivers experience the same problem but definitely very poor or non-existing service with not even a proper attempt to resolve an issue on a brand-new vehicle!