Hathway — False statement from installation executives (Madipakkam)

During the new connection, 2 of the executives from madipakkam chennai branch (Jai balan, Pandiyarajan) reached me and offer cashback once payment is done. They reached me till given new connection. Post connection, they are not get back for cashback and not even picking my call. When i reach customer care, no response, when i reach appellate, no response..Still complaint request mail is pending and not addressed.