Although it sucks that your new watch isn't working, sending it back to TT (China) is rarely worth the hassle i.m.o.
Any local 'smithy' should be able to open the watch and service the movement for you. At least give you an idea of the problem and if its worth saving.
Just thinking out loud here re replacement...but instead of going with a 3135, why not just go with the 'ol workhorse 2824 movement for your YM. It's easy to find, reliability is good, as is the price i.e. not expensive. Any watch-smith can get it for you easily. Or, you can purchase one yourself...
Now, you won't get those decorated rotors and bridges like the 3135, but it'll likely run better with increased reliability. And, if it malfunctions again 'down the road' refer back to my initial comment e.g. easy to find, not expensive.
To step out on a limb even further...if you determine that the movement is bad, they're really easy to replace unless you're 'all thumbs'.
Ummm...maybe I'm overthinking this, so I'll shut up for now.
Best wishes...