female workshop victim seeks advice – motor control lamp

Hello together, here is once again a female workshop victim and needs expert advice. The engine control light in my Streetka (2004, 1.6l.95hp) went on and I drove straight to the next Ford workshop:1. Visit: Ignition cable & spark plugs as well as lamda probe replaced plus other toys like oil change etc. =700,-€ I drive with my Streetka from the yard immediately on the highway and after 50km the engine light burns again:2. Ford visit: Exchange Ignition coil =300€ So dear Kundi Now everything is fine – after 50 km the lamp is already burning again3. Ford visit: “Oh that doesn’t look good” Catalyst has to be replaced – 1000 € please. So, dear customer now is really everything in order – drive with empty account from the yard and after 20 km already this crazy engine control light burns again. Quickly bitten into the steering wheel and immediately to Ford:4. Ford visit: Now allegedly also the cylinder head seal is broken and Ford would like to now also for this again I meant that probably only now the real cause for the burning of the engine light was diagnosed. Ford thinks, however, that the new damage has nothing to do with the engine control light and this is a consequential damage ?!?!?!Does that mean? Does the engine control light really not burn in case of a defect of the cylinder head seal and do you know what legal possibilities I have? I am happy to hear from you!