I have a dumpster at my shop because when I had trucks on the road I generated more trash sometimes than a residential cart could handle. Now that I don't have the trucks, and I have cleaned out a lot of the truck paraphernalia, I only need a small container. I have called the trash company a few times, left voice messages, sent several emails, and have never gotten a response. Last time I had a billing problem, it was the same story. I ended up driving to their offices and finally getting to talk to a human. The service rep was a nice young lady, and she said she would issue a credit for the three months they failed to empty the dumpster and I ended up having to haul stuff to the county landfill. A couple of weeks later another bill came, no credit was issued. Went back to the office again, she apologized and said she would take care of it while I waited, and gave me a revised statement.
So it looks like it's going to be another trip to their office the get this accomplished.
Unfortunately, they are about the only game around here for refuse and trash disposal, so they don't have a lot of motivation to provide good customer service.
If I had a dump trailer, I would just fill it up and take it to the landfill when it's full, and tell the trash company to kiss my butt.