Bought car morning 4/13/19, had test driven 4/12/1...

Bought car morning 4/13/19, had test driven 4/12/19 for test drive. All was fine on test drive. After buying as I was driving home, after about 20 miles, engine developed a noticeable tick. After arriving home I went to check oil and it was almost 2 quarts over filled. I had looked at this day before but car had new oil change and was very hard to see on dipstick. I actually drained and changed oil (that's how I know how much it was over filled). The tick wasn't caused by being overfilled, in fact, it's worse with correct amount of oil. Appears a couple extra quarts were added to hide the noise just long enough to sell the car. I called right as I got home (before checking anything) but the salesman I was referred to wouldn't answer page or cell number listed on his business card. I understand as-is but I expect at least honesty and no tricks. Masking an engine noise with extra oil was a dirty trick. If you deal with Andy Mohr GMC Buick in Fishers, you 'd better be go in with zero trust because if they did it to me, they'll do it to you, too.
4/15 update: Salesman finally returned my call, said service dept. wanted to see car. It there now and they said they would call me on 4/16/19 but no one called. They wanted me to pay for a rental car, of all things. I declined. I thought they wanted the car to fix it and make things right, but now since no one called as they said they would I think this was just another lie / trick. I wish I had never dealt with this dealer. The car is a lemon and has major issues. They should, at this point, unwind the deal so we can go our separate ways. 4/17/19 update: still no contact was me to me by service dept. or anyone else from this dealer. 4/18/19 update After making calls and emails someone finally called back. An angry sounding man said the car only needed lifters replaced and that had nothing to do with oil as I stated in my google review. Well, lifters don't just spontaneously fail, and they are directly related to oil. In the cars lifetime it was either ran for a prolonged time low on oil, or the oil changes were severely neglected, or both. Whatever series of events caused lifters to fail didn't just occur to lifters, but happened to whole engine. Replacing lifters may calm the noise for a while, but without fixing the the cause of their failure will guarantee they will fail again. If they failed to lack of proper maintenance the whole engine has to have been effected. Cam, valves, crank, bearings, the whole engine would have suffered and will have a shortened lifetime because of it. No one with any sense would to pay thousands for a car they know the engine will fail in before it would under normal conditions. Replacing lifters is a temporary fix to make a noise stop. Why they haven't started the process of unwinding the deal yet makes no sense to me. The car, even with replaced lifters, still has engine that had a traumatic past to have caused issue in first place.