Hot exhaust

Just wondering what anyone is doing about their exhaust system overheating. Our wheeler has been in the shop 3 tomes for the exhaust overheating and melting the plastic. Polaris industries has had our local dealership replace the same part going on 3 times now. It has been in the shop more hours then we have put on it. Now polaris will not talk to us about it. Anyone else having these problems? Anyone know how to deal with polaris? We are paying for a machine that we can’t use. Kinda frustrating. Polaris doesn’t seem to care to much.