Space usage not accurate?

Hi,
I am a free, non paid user.  I recognize that I get up to 2Gb free storage space ... cool.  I use it for a second online backup for mission critical home files, almost all only text, no images or videos or any files whatsoever that take up space.  In testing, I checked the volume of saved files, and confirmed that I am using about 1.5Gb of space.  Been like this for years.

Yesterday, I updated these files to reflect a couple recent additions, minor text files, Kb in space used.  Dropbox bumped up what it sees as the amount of space used, so it now thinks I am using almost 7Gb of space.  I triple checked the two files totaling about 100Kb of space of new files, and even deleted a couple hundred Mb or no longer needed files ... but this number did not change, even after 24 hours.

The problem is I lose sync capabilities, and receive endless, annoying popups that I can upgrade to a paid plan, which I dont need.

I again ... then downloaded every file into a folder on my desktop, and tested the space used, and found out this was 1.4Gb, reflecting the addition of the two files and the above deletion of a couple hundred Kb old files.    I tried permanently deleting all deleted files, and quadruple checked every dropbox folder for any files using up this space, but there literally is none. Every other Dropbox added access folder is empty.

Dropbox is outwardly lying and scamming the amount of space I am using, to try to sell me a plan I dont want or need. 

QUESTION: has anyone else seen this behaviour, or know any tricks to make the interface show the actual amount of space used?  Obviously given the scummies-ness of this behaviour, IF I was in the market for additional online storage ... I would never use dropbox ... not now.