Stay away from Service! My Audi A4 was consuming o...

Stay away from Service! My Audi A4 was consuming oil, I took it to Prestige Imports to have oil test done. Audi corp agrees to pay to have my engine rebuilt due to excessive oil consumption. I get my car back and CEL light comes on after 2-3 days. I call dealer they say, "we told you to do other items in service you declined, that is probably why you have CEL light". Funny, didn't have CEL light issue before rebuild, just after.
I replace everything they suggested and still have issue. I call service they said bring it to us so we can fix this issue (no mention of diag fees on phone). When I show up to drop off the car, they say it may cost $150 for diagnosis if it's not something they did wrong.
So they rebuilt my engine, I have a new issue potentially caused by the rebuild and now they want more money just to diagnose the issue that came up days (that started less than 100 miles) after I got my car back. Now they are replying to my reviews with some stories about me wanting all this fixed for free. Stay away, have no clue on the sales side or porsche side (i'm never bringing my pcar here that is for sure) but the Audi service group should be avoided at all cost.

UPDATE: The BS they posted below is just that BS. I never asked to have my car fixed for free, I asked you guys to figure out what was wrong with it before you charge me. Oh and the ring service WASN'T FREE, AUDI USA paid you for that service and I paid for the parts your tech destroyed removing the engine. You guys are the reason the car industry has a shady reputation. If you agreed to do the diag for free as you stated then you wouldn't have me out here warning others of your business practices.