Yes, I have. A couple of years ago I bought my dds Columbia winter coats (got a steal on Black Friday!). My older dd wore hers the first winter. It still fit the next winter, but part way through, the zipper broke. I sent it in and about 6 weeks later, we got a brand new coat! My dd wore it the rest of the winter. The next winter, it was too small for my older dd, so my younger dd wore it. The next year, the zipper broke on the replacement coat. I sent it in and, about 6 weeks later, we got another brand new coat! That is what my younger dd is wearing right now. I did not have the original receipt. I gave them all our contact info, the estimated date we bought it, and the store it was from. (I actually went to the store first, they said to go to Columbia's website.) I put what was wrong with it, even though it was obvious. I am 100% happy with it and would DEFINATELY buy another Columbia - especially having 2 children close in age that the coat can be handled down to, making the warranty even better! I would highly recommend sending yours in - put down all the info, including the zipper not staying shut. I would bet they would send you new ones. It is WELL worth the postage to send it!
S.