Worn Seatpost
 

I recently replaced the seatpost in my '83 gitane super challenge and I think I failed to tighten the clamp enough because I caught my pant leg under the saddle while I was jumping off and I pulled it up a few clicks, when I got home (~2 miles) I retightened the clamp but ever since then no matter how tight I get it, the saddle will still rock back and forth without too much pressure.
The clamp is the newer style thats integrated into the post, and I'm wondering if I could prehaps file a new groove to save it as I don't have enough money to replace it yet.
Any other ideas are also greatly appreciated (I always love cool ways to fix things)

The clamp is integrated into the post? There's no seat binder bolt?

I think the OP is refering to the seatpost/saddle rail junction.
Take it all apart and examine every piece. Make sure there are no burrs or any foreign material that could keep the clamp from tightening properly. It's a simple apparatus, there can't be too much wrong with it, unless it's cracked or something. Why would you ride it without it being tightened correctly?

Oh that makes sense.

Uh, OP. Take apart the entire clamp clean the grease out of the splined interface, regrease the bolt itself and reassemble. While the seat is out - visually inspect the condition of the rails to see if they've been worn away.

Thank you, And I didn't think the post was loose I was in a hurry when I was installing it though as I was borrowing an allen from someone at my LBS's workbench.