zaq08, I did receive calls like that and others asking on whatsapp then disappearing.... But think of good willing people who you lose by those quotes....
I generally change cars every year or so because I like upgrading. I never expect the buyer to pay my new toy... It's ridiculous.
Some use their cars for a year or more and want kinda a "reimbursement" of the total amount they paid when they want to change and of course they claim they are leaving for good or.....