BEWARE >> LOTS OF DISHONESTY ... And POSHMARK is full of theM!

I have no doubt I am the only person who has had this problem on here... AND ONLY ON THIS SITE ! I have bought 4 items this year on Poshmark in which 2 of the sellers accepted my offers for & the other 2 I purchased at their listed prices ... However the sellers turn around & cancel my order so they could relist for MORE MONEY. Each one I contacted the seller to see about the cancelations and/or potentially repurchase but they were unwilling to honor my original purchases. I am beyond frustrated at the immoral, dishonest sellers/people in the world today. I could never imagine the kind of person with zero consciences to pull this crap. poshmark needs to enforce a way to stop this!!! MY MOST RECENT PURCHASE of Nike Force Dunk Sky shoes just last month is the most sickening of all! The seller had just recently listed the shoes at $60: > we chatted about the shoes > she accepted my offer of $40 > then cancelled my order 17 hours later & simultaneously RELISTED FOR $200 ! I AM SO TIRED OF DISHONEST SELLERS ON THIS SITE! What happened to honest good human-beings?