Indian Oil Corporation — regarding refill the cylinder not in time and harassh customer

Address:

Darbhanga, Bihar

i m resident of mohalla benta laheriasarai darbhanga bihar . i several times lodge complain to engineers gas services to refill my cyllinder on time but they never take response .they only harassh the customer and dont take response of complain .After complaining time to time their delivery boys never take response.what is the reason i dont know i also submitted all the documents on time required by the dealer.Please take urgent response.whats the fact please solve. im waiting.thanks