Kekan LPG Corner, Vidyanagar review: delivery charges

I am very disappointed with the service offered by the delivery boy in the kalwad, lohegaon area, they have charged extra for delivering the gas cylender. I had received a message saying, i should pay 870 rs. When the cylender was delivered i gave him 900 rs and he was not in a mood to return the money, he said the cost is 890 and he does not have 10 rs change. This is disgusting. The charges are not at all reasonable, if they are charging such an amount from every customer that means they earning huge. Let me know if there is a way to escalate this to the highest authority. Poor people are suffering the most, because they are not aware of such frauds. I request each and every individual who is willing to take a new connection, not to go with Kekan LPG corner. Look for some other provider. I will be disconnecting my connection too.