It's fraud. No if, ands or buts. The client hired you to do X then you should do X. You can suggest to do Y and if the client clears it then you do Y, but only

It's fraud. No if, ands or buts. The client hired you to do X then you should do X. You can suggest to do Y and if the client clears it then you do Y, but only if the client tells you to do Y. If I was the client I would be furious. If the client or I want to shoot ourselves in the foot by building the project on framework A or language B then it is our right to do that. One thing that separates a good programmer from a great programmer is to recommend technologies and explain why, but no matter what you build what your told to. A great programmer will warn me and explain why, but if that programmer is told to do it anyways then they damn well better do it as they were told.