delay in completion and handover you are entitled to claim compensation at 18% pa from last date of payment until possession is handed over to you, this you can do by filing a consumer complaint before the District Consumer Disputes redressal forum in your state.
In addition to the above, you can also claim damages from builder including litigation costs as well.
To get the process started contact a local advocate, get a legal notice issued giving the builder 15 days to comply with your demands, failing which file the complaint.