I have replaced my back door and front door both. ...

I have replaced my back door and front door both. There is gap between door and trim but he said it is suppose to be like that, I told him why my other house door is perfectly fit then he answered me that door has something wrong. he called his supervisor and came he explain it should be like this I have convinced. But after the door installed he put the door trim. Side of the door trim and wall has big gap on both door. I told him why this is big gap he said it is suppose to be like that again. i told him to nail. he put some nail on back door trim and front door has same problem . Worst finishing on installation. I feel very bad with spending 7K for the new door even worse than old one. I am not happy at all. I have attached here just two pictures.