Mahanagar Gas — meter not installed even after making full payments & pipe installation

Dear manager,
Our society supreme willows co-op. Hsg. Society is located at charkop village, kandivali (W), mumbai-400067. There are total 114 members in the society out of which 100 members had applied for piped gas connection & made full payment in sep 2017. The gas pipes have been already installed & meter installation work also started in november 2017. However suddenly the technicians left the meter installation work in flats on 14th & 15th floors of both the wings of our society. Now there are 20 flats in which meter is not installed inspite of the full payments done by members to mgl.
We have also raised a complaint through mahanagar gas custome care. But they suggested to visit the mgl head office at bkc. We had also approached the technicians who came to our place before for meter installation. However they replied that their contract with mgl is over & now when the new tendor will open, mgl will send new technicians.
We are really disappointed that inspite of making the full payment, building is gassified building and also available as per your records where connection is granted, there is failure to install the meter and start the connection.

Kindly review the matter as the earliest and support with installation.
Regards
Darshana shah
(Society manager)