WENT FOR SERVICE CAME HOME WITH NEW ISSUES

I took my car for service for a 75k OIL CHANGE and to change my rear brake bulb, and I really appreciate the receptionist and staff but what the hell was the machanic smoking!

I went for an oil change now the next day my car didn't start!

Eventually it started, next thing when I brake all my lights went on and my tracking service called saying there was an signal interruption in my unit now a message appeared on the dash saying "check hill assistance" my maintenance book is fully stamped by this dealership I've never had an issue now today It just wont start!?