Do you think it really has that big of an impact to possible customers? I mean, once you click it it's pretty obvious that your service isn't a scam.
Couldn't you just start another topic for your service (if you don't have an official one already), once that one has more replies, it might show up on top in the future?
A-ads have their official topic. It's older (made in 2013) and have much more replies (54 pages). So, it's strange that official topic shown in much lover position than this accusation.