From what you say, then to me that is purely incompetence, I have totally rebuilt several of those Sofim engines in the past and I am just a time served motor engineer , not a specialist engine reconditioner/rebuilder.
Millions have been made and many have managed 400,000 miles or more. I had a couple with over 200K miles.
There is even a Russian uTube video of them stripping and rebuilding them, if they need a guide
I suspect as the repair was coming out of their own pockets, it was down to the cheapest price possible.
If the job was done right in the first place you would have done several thousand miles happily in your Motorhome by now.
As I mentioned before, I have seen where valves meet the pistons on those engines, usually due to a belt failure for whatever reason, in all cases a con rod was bent due to the piston contact with the valves being transmitted to the con rod as they come down vertically from a cam direct with no rockers to snap and take some of the impact.
Even if as you say they report"They told me the cambelt was still intact" I would expect that if the engine stopped suddenly due to valves hitting pistons then at the very least the part of the cambelt teeth under the crankshaft sprocket would have stripped, even if the belt hadn't physically snapped.
Given the time you have been without the use of a fairly expensive purchase, it may be time for some good legal advice and an independent engineers report etc.
I have just looked up my first reply to you mentioning all these things, I see it was a year ago, Wow!!!
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