That's a curious sentiment. I'm a member here now for some 7-8 years and I gotta tell ya, I have a harder time finding trainers that don't work than ones that do. The ones that don't work are often retired and even many of those are still working. Sure, there's others that may not work usually after one or more patches from game devs but you just have to report the problems and hope the trainer is still enough in demand to warrant an update.
And look at this thread about upgrading memberships. Nine pages of satisfied members filled this thread in like 15 hours. Logic has to tell you these are happy members, more than satisfied with the work done by these good folks.
My only suggestion is post to the trainer's thread for the game in question and put some details about what you've tried and what's not working. And only do that after going through the Troubleshooting guide in detail.
I hope you can get things sorted out. Most of these trainers are working as intended for the majority of us.
[Edited by element5, 8/6/2015 2:17:42 AM]
* Updated game trainers and cheats daily
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* Request which games get new trainers
* Priority support with any problem