Seam separated after 2.5 months

My 12 year old son bought this to furnish his room as a "hang out" for him and his friends. This was a great, inexpensive option for him and upon receiving it he absolutely loved it! Unfortunately, after 2 1/2 months of light to moderate use the seam separated and the part you sit on is now deflated. I am going to try to melt the seam together carefully, but we are very disappointed.

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