At the end of it all, it should always be about highest cash payouts for your junk cars or vehicles in Melbourne. Over the phone or online estimates that they provide should be a good indicator as to how much they will be paying you for that scrap car.
However, you should not depend fully on the first estimate they might have provided. Once they get at your locations and do their formal vehicle assessment and verification, they should present a final quote to you.
If it is accurate or near the estimate they offered over the phone, continue with them for your junk car removal service. If not, there is no necessity to still sell your junk car for a significantly lower amount than what you were expecting.