Videocon D2H — Replacing of set top box

My set top box is not working so I called the videocon d2h cc executive for replacing of set top box.. He told me 200/- engeneer charges+250/- new set top box replacement charges.. When engineer came he told me 200/- his fees+399 set top box charge+400/- recharge +370/-remote charge.. Why company making foolish of people??worst experience.. Also companies own engineer blames that Adaptor we are using is not of good quality.. I told him that I got this Adaptor from your company only.. It's not from outside purchased.. So why engineer also gives such information.. Then if he could me chatged soo much amount, bt how can I keep faith on it??