Tankless hot water heater

This company should not be in business,I've been dealing with them since June.I call there to get updates as to whats going on with my water heater and always the same thing I'm trying to get ahold of this one and that one.Have asked many times for the paperwork on this supposedly new unit which action says is new who knows I can't get the paperwork from them.He originally sent a tech to fix my other unit which was only 2 years old and his tech did something that caused the wires to fuse together and burn up,could of burnt my RV down.So he buys a new one supposedly and it's never worked either.The last time I actually spoke to the owner which was on July 31rst,I was and am so frustrated now and tired of having to chase them down because they don't return calls that's Jeannine ...she may talk to me but has no info worth passing on always says when I know something I'll call hmmmm....well no calls....I did get a call from the owner in fact he left a message telling me to stick the hot water heater up my ass...quote unquote...I repeat don't ever do business with these people unprofessional and just not worth all this aggravation...so I will let small claims court handle this problem,I'm done with being nice now.....Will have someone who knows what their doing look at it Monday morning.