My son recently travelled to view a car he wanted at a dealers and which he subsequently bought. He was given a verbal 6 months warranty. 2 weeks after buying it the exhaust backbox split and needed renewing. So he could use the car I bought him a backbox and I fitted it for him (good old dad) He then contacted the dealer who eventually reluctantly agreed to send a cheque for that amount but which never arrived. Despite several phone calls later during which the dealer always gave excuses and promises of reimbursement, there was still no cheque so my son persisted but the dealer is now not answering his calls. He is now texting the dealer but is not receiving anything back. How does he stand and what would you do ?