Unfortunately there is no dipstick on these cars so the only way to check the oil is to get an oil change done, hopefully the coolant is not finding its way back into the engine or else you have a HUGE problem on your hands. Have you noticed any drips underneath the car? Popping the hood do you smell coolant (sweet smell)?
I find it a little hard to believe a dealership could not find a leak when its clear you are putting coolant in the system and it then finds its way elsewhere. Any simple pressure tester can find this. I would do as they say and keep an eye on it, if it goes down again I would bring it to a different dealership and ask for a pressure test & if that finds nothing then maybe perhaps an oil change to make sure the oil doesn't appear milky.
Good luck!
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