T-Mobile Take Action
Report it. Many people have said that they tend to look at the posts.
As for them improving signal strength, I'm sure they will tell you they are expanding (no carrier will ever say otherwise).
A little example I can share is when I had T-Mobile originally about 5 years ago, I reported and told them my reception problems at my house and my surrounding city. They told me they were looking to expand there within the next year or so. I now have T-Mobile again, and I still have the exact same problems I did then now. So it really depends I'd say.