So I bought this brand new road bike and put everything together, and when I was putting the seat on, the seat post slipped out from under the seat and got stuck inside the bike frame, like actually inside the tube itself. I have tried everything to get it out, both with WD 40 and turning it upside down etc etc.... It's really frustrating when everything was going smoothly yet this had to happen. Before I take it to a bike shop are there any alternative methods anybody could suggest, please? thank you.