Indian Oil Corporation [IOC] — not receiving gas cylinder

Address:

D35/331 Jangambari, Ramapura, Varanasi, Uttar Pradesh, 221001

My consumer id is 28112 and ref no.[protected] and lpg invoice no. Is[protected] and we are connected with sehgal gas agency, kamachha, varanasi
This is the second time when i booked by gas and received all details by message but i didn't got my gas cylinder. Here i am getting details that i will get it within 9 days but not get anything. There was a delivery boy name mr. Chandan. From last few years he is coming regularly and last time also he came to deliver. I just called him and asked then he said that "he didn't get sanitizer from office that's why he is not going" which is not a valid reason.
I think he is selling it in black because i got the message that my cylinder is delivered but i didn't get
I want solution because this is not the way to give service to customers.