2006 AUDI A6 Unknown Or Other Problems

AT 150K MILES, EXPERIENCED NO CRANK, NO START. TOW TO DEALER, AND I HAD ALREADY DONE SOME TRIAGE. THEY DID 2 HRS OF TROUBLESHOOTING PROBLEMS THAT WERE NOT EVEN RELATED, SO I TOOK THE CAR BACK. FOUND A TRUST WORTHY MECHANIC AND HIS DIAG SUGGESTED THE SCM BURNED OUT TAKING THE PCM AND ECM ALONG WITH IT. THE COST WOULD HAVE BEEN IN THE $6000 RANGE AS HE STATED A %40 FAILURE RATE AFTER 150K IN ALLDATA. HE ALSO SAID, IF I REPAIR IT, I NEED TO REPLACE THE STEERING COLUMN AS WELL BECAUSE I WILL JUST HAVE ISSUES DOWN THE ROAD IF I DONT. THE CAR ALSO HAD A SLOW OIL LEAK. THE PLACE WHERE I BOUGHT THE CAR SAID THE REPAIR IS NOT WORTH THE COST, SO THAT FACTORED INTO MY DECISION NOT TO INVEST IN REPAIRS. THE OIL LEAK WAS SLOW AND I NEVER HAD TO TOP...

I HAVE A USED 2006 AUDI A6 QUATTRO 3.2 [WHEN PURCHASED IN 2013 IT ONLY HAD 89,000 MILES - CURRENTLY AT 111,139 MILES]. LAST WEDNESDAY 06/15/2016, THE CAR REFUSED TO TURN OVER, HOWEVER, THE RADIO, MMI, EXTERIOR/INTERIOR LIGHTS WERE ALL OPERABLE. AFTER INVESTIGATING THE ISSUE MORE, I REALIZED THAT THE ELECTRICAL WINDOWS REFUSED TO RAISE, THE DASH DIDN'T ILLUMINATE, AND I WAS UNABLE TO PLACE THE CAR IN NEUTRAL. LATER THAT EVENING, MY INSURANCE PROVIDER SENT A TOW TRUCK WITH A FLATBED - THE VEHICLE HAD TO BE CHAINED TO THE TOW TRUCK AND PULLED OUT OF MY PARKING SPOT BECAUSE THE WHEELS WERE LOCKED. IN THE INTERIM, I RESEARCHED MY ISSUE ON THE INTERNET AND FOUND SEVERAL COMPLAINTS RELATED TO MY EXACT ISSUE, WHICH WAS LATER DISCOVERED AS A TRANSPONDER FAILURE THAT WOULD REQUIRE AN ENTIRE NEW STEERING COLUMN BECAUSE THE COMPANY (AUDI) DID NOT SELL THE PART SEPARATELY....