Great Eastern Trading — installation of samsung a c 1.5 ton

Address:

Howrah, West Bengal, 711302

Ref purchase bill no g1524/1718/07307 dt.26/01/2018, installation by m/s s n enerprise (Samsung authorished service center) cash memo no 3601 dated4.2.2018 of rs.6300/-
Copper pipe [protected]@250/- per ft rs.3000/- market rate @170/- per ft.
Lpc tape 2 pcs @600/- per pcs 1200/- market rate @ rs50/- per pcs
Outdoor fixing angle... 300/- market rate 200/-
* outdoor angle received free with product
Water pipe [protected]@ 30/- per ft rs.660/- market rate 20/- per ft
Cable wire 27 ft @ 45/- per ft rs.1215/- market [protected]@35/- per ft
So rs. 2250/- extra charges clame and received by sumsung authorished service center, i want to know which email id i complan for the same, and i also inform you if i have not return excess payment of rs 2250/- i want to go consumar foram about this matter