Indian Oil Corporation — GAS CYLINDER-NATRAJ ENTERPRISES, YELAHANKA NEW TOWN, BANGALORE

Address: Bangalore, Karnataka

Dear Sir,
Sub : Excess money charged for Gas Cylinder by Nataraj Enterprises, Yelahanka Bangalore
Ref : 1. Invoice No. 19571 dtd. 23.06.10 for Rs. 325.20
2. Consumer No. 21696
I have placed order for Gas Cylinder replacement on 22.06.2010 and they have raised the above bill on 23.06.10 for Rs. 325.20 and visited our house for delivery on same day but returned due to door lock.
He delivered on 26.06.2010 with the same invoice and demanded for Rs.361 (rate revised from 26.06.2010). The Manager of Nataraj Enterprises demanded me to pay the revised rate and he arrogantly informed me to complaint with anybody. Ultimately I paid under protest.
Please let me know whether he can collect the old rate as the booking date and billing date earlier than the revised rate date and the logic as well as the ethic behind his motive.
Best regards,
Krishna Prasad TK