Bharat Petroleum [BPCL] — Refilling of cylinder

I have booked a cylinder for refil on 27th Aug 2021 but not yet received despite raising 4 complaint on their customer care number. It's seems they don't care at all. Customer care take complaint in the morning and complaint department close the case in evening without resolving the issue.

I ask them for escalation methods but it seems they don't have any clue.