Mahanagar Gas — Nobody coming for laying the gas pipes

Hi,
My BP no. is [protected] and CA no. is[protected]. It's been for the last 2 years that the application for Gas pipe connection was given and all money paid but nobody came for laying the pipes. Meanwhile twice I received a letter that someone has visited the house but nobody was there.
I have been myself calling customer care and writing emails that we have been waiting for someone to visit but no one visited till date and a false statement is being made. Every time I am only getting assurance from the call center and being provided with reference nos. like 6822303 and 6898319.
Once when I refused to put the phone down until my problem is resolved, the reply from the call center was that connections can not be given to your flat due to its location( floor height). My flat is on the 6th floor and everybody has gas connections. I have recordings of all conversations but really don't know how to get the gas connection. Writing emails and talking to customer care isn't solving my problem.

Request to do something positive in this regard.

Thanks