Unhappy for not imperium willingness to buy other gearbox for us

I and my brother khaya we bought gearbox, we were communiting with Herbett and told him we are looking Chevrolet Sonic gearbox and he said they do have a gearbox @ R800, we even send the picture of the checrolet sonic automatic.We learn after bought the gearbox that its not the same. We were ab is. The issue is we want them to buy gearbox for at just engine where find the exactly same gearbox(6T30), imperium sell as gearbox for Chevrolet cruse which (6T45) which is big than Chevrolet sonic. We want the refund or they buy us the gearbox that is Chevrolet sonic automatic