Stay away from this service quite clearly, the guy seems to be the only one of its kind around and…read moreyou can tell! Not in time for the arranged on-site visit, takes our own description of the problem as his problem detection, fails to communicate (promised a call back with prices within the week but never called!) and finally charged for his time without further comment.
By no means should a craftsman work for free or should not charge for coming on-site but the service around matters as much as the on-site service and if you cannot even comply with your own promises in timing and activities and then charge for something you had been told by your customer you are out. This was not the first time, by the way, but certainly the last time!