Dear @mpsajnabi
You can lodge an online complaint about delayed piped natural gas (PNG) or LNG connection to BPCL officials through the online grievance form (bharatpetroleum.in) available on their website. While lodging your complaint, you may provide the reference/customer ID (if any) with location.
Additionally, you may call the toll-free helpline number 1800224344 (BPCL Smartline) to raise your concerns with higher officials.
For more help, read: How to file complaints about Bharat Gas and petroleum products of Bharat Petroleum Corporation Limited (BPCL)?