I've lost access to my Dropbox account and email address and I can't cancel my plan.

I am trying to remove billing for a Dropbox account that I have lost access to both the account and the email address it is linked to. I am currently paying for a premium product that I no longer have access to and cannot contact Dropbox support for help.

 

Their 'chatbot' is one of the most useless I've encountered, they have a billing contact form - when you press submit it simply says 'There has been an error', and a phone system that just tells you to use the support screen in your account and immediately ends the call. These options simply DO NOT work for all scenarios, Dropbox!

 

I can't believe how poorly a company the size of Dropbox can manage customer support. Has anyone any experience of dealing with them? can you offer any advice so I might actually speak with someone, either through phone or email?! I'm at my witts end. I just want to remove billing details from the account.