I'm going to add that when you use the update request form it is very important to expalin what factual innacuracy you want corrected in the 'reason' field.
If you are trying to add keywords or non guidelines compliant Title and Description changes at the same time, the factual change may not be noticed when the update is declined because of the non-guidelines compliant content
eg "URL has changed", "We no longer are located in kickatinalong, but have moved to whykickamoocow", "The business no longer provides (insert product/service here)" Are likely to get the desired response, something like "Real estate in town1,town2, town3, town4, town5 and the greater state of megalomania, specialising in houses, homes, condos, flats, highrises, and much much more" is likely to get declined when the factual change required is that they are trying to say they opened a second office in the next town over.
Your Mileage May Vary, but I do many update requests most days, and clean factual requests are more likely to get done as requested, in my experience.