I had the exact same problem with my oil drain plug a few weeks ago. Bugger just did not want to come off, am sure the dealer over-tightened it.
Before trying again I made sure I had a new bolt and washer (only about £2) as I had a feeling I'd wreck the other one getting it out.
I got a longer wrench and after much straining and rounding off of the edges of the bolt, I lightly hammered a slightly smaller socket over the top of the existing one, and that finally removed it.
Retorqued the new one to the proper settings and all is now well.
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