Indane — mistake made by your employed in name

It is a case of purnea, indane popular gas distributor .The employee mistaken my dad's name in updating his while name is correctly written in the owner book of cylinder and written laxmi kant mishra instead of laxmi kant sharma and when my mom asked to correct it he told that there will be no problem in it and for it my mom told them many times but they didn't listened to her and the cash memo is still in the name of laxmi kant mishra and during DBTL registration when we asked that will it create any problem in this registration than he told yes and asked for 1500 rs to change my dad's name which was a mistake of your employee and now on cylinder we are paying 827 rs but no getting the subsidy