Big Trouble From A Builder

Dear friends,

I have booked a condominium (apartment) in a well known project in Karachi. I have already paid all my installments and development charges etc. Now it is more than 9 years since the project was started but project progress is extremely slow and it is only 20-30% done as of today. I don't think that this project is going to be completed in near future. As per our agreement with the builder they supposed to complete the project in 42-48 months but it's more than 114 months.

I need your expert advice as how to resolve this matter, I want my paid money back from them or they should pay me rent on monthly basis until the project is completed. Is there any govt. Authority in the city which resolves such matter.

Please give your expert advise and help.

Regards.