Lots of dual mass flywheel problems reported on DSG drivetrains and a recall of over 40,000 in the USA. The transmission oil cooler problem is a fundamental flaw based on a risky design of passing a heat exchanger thought the coolant radiator. Fine in theory, but if any seals give way, totally disastrous. I'd use the small claims track of the county court to sue for selling you a car of unsatisfactory quality due to a fundamental design fault. Mercedes autos from year 2000 to 2004 had precisely this problem. Renaults used to have it until the potential for the problem was designed out of its cars, like the new Laguna diesel auto that has four entirely separate radiators: coolant, a/c condenser, transmission oil cooler, intercooler, so fluids cannot mix.