Mini or Maxi

I bought this so that I could tuck it away when not in use, so on the first rainy day, it was more like a shower, I thought I would give it a try, I must of received a defective one because mine wouldn't stay open, and when it did, it buckled under the smallest amount of wind and turned inside out, I am now attempting to return it but am having the hardest time trying to get the seller to email me a return code and hopefully a pre-paid label.