New carpet problem- mass backing issue

I`d send it back. That looks like a half-assed job. If nobody calls them on the crap they`re peddling to the public then they`ll continue to push crap like that. You are right, it`s your hard-earned money and you should get what you paid for. Send it back, get them to pay shipping both ways and tell them you have a deadline to meet for the job to be completed. I hate to see sh*tty work like that. It shows that the people working there don`t take pride in their product.