@Gistloversblog1 He should ask for a refund. Phone prices are not stable because phones are in dollars. And one of the criteria to instalmental payment is price must not be same as one time complete payment. You pay the 50k or request for a refund.
@Gistloversblog1 The vendor is actually at fault. He should have slated initially that prices are not fixed and client has to pay the current price on collection day