D-Mart / Avenue Supermarts — Extra charge for not buying item

Address: Surat, Gujarat, 3928200

Sir,
I bought 2 half pants for my 3 month child but in invoice I was charged for 3 half pants.i was unaware about this thing untill I checked after reaching home as I purchased 22 items.very next day morning I approached to customer care at d mart at adajan surat. Your representative noted my query & told that they will know me upto today evening after two days they haven't replied me. When I called them they told that no any complaint registered on your name. How many times should I approached to them for my own money? No any satisfactory answered given. Memo detail cm no 06-0137 dtd 24th jan 17 time 07:15 PM . cashier:JC /06.kindly help or I have to approach towards customer complaint authority for this cheating.