Sudden, massive spike in session usage since may 31st

[u/QuietusDK]

Hey all, I hope someone can help me understand, and perhaps suggest a solution.

I've been running a Pro Plan since march. I've used Claude for various purposes, most noticeably 3 major chats that I have been running for months (reset them with BASE and document handovers to prevent sanding up entirely), using these chats to document both life, a medical procedure and treatment, as well as everyday motivational purposes. So, yes. Fairly complex things with keeping track of conversations, and events in my life, helpåing keeping track of Gmail and calendar. obviously also run other chats for more specific purposes, but nothing in nearly the same size.

No API token usage, no code, nothing in that department.

Usage normally not a problem, kept well within the pro plan, except for one instance where I had to top up because I had all my major chats rebuilt.

Fast forward until yesterday, where I wake up to a message that Claude has refilled itself for 300 euros worth. Or rather, I got a "prepaid extra usage". The receipt only listed "prepaid extra usage, individual plan".

So the difference went freom a 22 euro monthly plan, to a sudden top up across one morning without any significant warning. I did not perform any actions that were unusual, that I was aware of.

I haver tried to find out what caused it, without luck.

There are no API keys in use. No claude code. I do not see that I have made any actions in any of the chats that would leave them running in circles.

After this, I of course tried to raise a ticket with Anthropic. The AI agent as rather unhelpful, claiming it only had the mandage to reverse any recurring costs, not the prepaid ones.

I of course diabled further top up options and so forth.

While I was lookling into this, I could see session usage going up, after the timer reset - we're talking that with only tyhe app open, no tabs in browsers, no other devices, I could see, every time I refreshed the screen under usage, I could see session usage goinf up, until it maxed out again, and this time, weekly usage had been maxed as well.

I have created a new ticket with them, both asking for a refund on the prepaid tokens that I had not consented to having topped up, as well as help to find out why this usage suddenly goes entirely insane, but so far I have been met with rather limited help.

Am I locked into chargeback options, or is there hope that Anthropic might come to see my side of things - that I have not requested an 8 x monthly pro plan cost 'top up', especially when not using API keys or similar?

Also, what on EARTH would cause this, because I saw no immediate reasons for it?

Help, please. It's already a rather difficult situation for me in real life, I would really like to not also have to struggle with this.

[u/QuietusDK]

Update: I have just received a mail that my account has been suspended for suspicious activity? What on earth?!

[u/mystery_biscotti]

You gave Claude access to your Google Calendar, did I read that correctly? If so, it's wise to start with resetting the Google password.

Sounds like your Claude account, and possibly your Google account, were compromised somehow. Hopefully you were doing data exports and can get your chat history at least.