Not to worry we're here to help - and you can also always reach us via our other support channels, here.
Now, your Dropbox quota is calculated based on the total contents of your Dropbox, which includes shared folders. If you are currently on a Basic plan, you have 2 GB of total available storage, and so if you were invited to a folder larger than that it would explain the error you are getting.
If so, you can ask your company to share the content with you via a shared link, so that it won't take up space on your account.
You can also review your account's space in the Plan tab of your settings.
Let me know if this helps or if I have misunderstood and we'll continue working on this together.
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