Ripping-off Brits is, as I'm sure we're all aware, a National pastime, and buying wood seems to be looked upon as 'Harvest time', for the dealers. I had a very similar experience to yours last year.
I tried to start a thread last year where people could write on here, a list of dealers to avoid, or, heaven forbid, where they had been treated fairly.
Unfortunately, though it was in English, and I did post twice, no-one seemed to understand what I'd said, and I had people telling me how they pay the mayor 5 leva, and go and cut their own trees, or how they watch every log loaded and unloaded from the lorry. Sometimes I wonder what some of the people on here are smoking.
Maybe your post could resurrect the idea. All that's needed is name and location, after all. So while I'm at it, if you're in Sliven, do NOT use the dealer on the top corner of the Onvor road. They are total robbers. Similarly, does anyone know of a GOOD dealer around Sliven?