This could be an expensive repair. The good news is this happened while you are still under warranty. The bad news is your machine will be unavailable for a time plus all the hassle. I urge you to start maintaining records on the issue because several initial "fixes" may not get the real problem. Take photos and/or videos. Keep copies of all paperwork. Write and keep memos to yourself documenting all oral communications with your dealer and/or Kioti US. Put the date on everything.
It's possible that this problem is something as simple as bad fuel, a plugged filter, or a dirty fuel injector. On the other hand, it could require a complete engine rebuild or replacement; that's pretty major.
It stinks that you apparently got a bad machine but (as was mentioned above) this can and does happen with all brands to some degree. The measure of a quality operation is how they deal with the problem. For your part, try to remain professional (but persistent and determined) in all your dealings with dealers and/or Kioti.
Don't let all the Kioti "problems" on TBN convince you that Kioti tractors are crap. In general, Kioti owners have less access to dealers (compared to Deere, Kubota, Mahindra, etc.) so they are more likely to use Google, and find TBN, and discuss their problems here.