WIth respect to support, everyone may have a different experience, and I'm sorry yours was not good, but I still want to say that the team has a pretty good track record, as is visible in the previous reviews.
I have just searched the forum as far back as Nov. 2011 and could'nt find any trace of unsolved such issue. Please contact us back if it was not solved in the mean time.
That said, IF you enable sh404SEF social buttons (include Facebook buttons, Twitter, G+), they cannot work together with other extensions providing the same buttons. You have to enable either one or the others. OF course, using sh404SEF social buttons will have benefits, such as "like", "Tweet" and "share" analytics reports right in your site backend, as sh404SEF Facebook buttons are automatically connected to Analytics.
sincerely, Mauricio Vuljevas.