I had a problem w/my first season tokidoki bambino, the rivets came loose and the strap came apart, this happened on TWO of the same style bambinos, so finally I talked to lesportsac, and they don't repair them, but they can exchange/credit so I got a creidt and ended up w/my dolce citta rosa. I was kinda annoyed they didn't tell me they couldn't repair it until AFTER I sent it to them, bc now I don't have the first season print anymore. Anyhoo that is another story. But my dolce has been fine. I did get the original bag direct from a lesportsac store though, and I had the receipt. I don't remember if they made me send the receipt back with it though.
You should just call lesportsac and insist on an exchange.
Wow that sucks that it happened to 2 of your bags!! I hope this quality issue doesn't happen to a lot of people! I forgot to mention in my last post, Lesportsac does require the receipt to be sent back with the bag, even if it's a department store receipt.