I have a very similar issue with this cemetery in 2015 while I was in Massachusetts researching my family. I made server requests for information which were never answered other than they were unable to to find the family members that I was looking for. I ended up going to the main office while in town and they were unable to answer any of my questions just giving me a phone number to call, which they did not return my call until I was already back home in Oklahoma. The grounds keeper did send me to an area of the cemetery where based on the years of death that the plots should be, but after 2 hours of searching I gave up. I have 5 death certs that list the Cemetery as where the family was buried and they still cannot find any records.
All my other cemetery visits while in the area were awesome, found all the graves I was looking for and I am very pleased with the management of those grounds.