Verizon Signal strength?

I do not care what Verizon's claims are regarding their service map. I use to have great service everywhere including my office. But about 9 mths ago something changed and my service at my office has been almost 100% useless. If the version signal would drop out enough I would get FULL signal roaming on an another carier. No data but I could make and recieve calls. BUT NO! Verizon hangs on even at ZERO BARS. Nothing I seem to be able to do will convince them that they changed something for the worse and that they need to change it back. I am about ready to just buy my way out of my contract and be done with them.